Age of the Squantum "Tillite," Boston Basin, Massachusetts: U-Pb zircon constraints on terminal Neoproterozoic glaciation

American Journal of Science

Volumn 300, Issue 8, 2000, Pages 630-655

  Thompson, M D ^a   Bowring, S A ^b  

^a WELLESLEY COLLEGE   (United States)

^b MASSACHUSETTS INSTITUTE OF TECHNOLOGY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0034550671     PISSN: 00029599     EISSN: None     Source Type: Journal    
DOI: 10.2475/ajs.300.8.630     Document Type: Article

References (135)

1. Åhäll, K.-I., Persson, P.-O., and Skiöld, T., 1995, Westward accretion of the Baltic Shield: implications from the 1.6 Ga Åmål-Horred Belt, SW Sweden: Precambrian Geology, v. 70, p. 235-251.
2. Anderson, M.M., 1978, Ediacaran fauna, in Lapedes, D.N., editor, McGraw-Hill Yearbook of Science and Technology: New York, McGraw-Hill, p. 146-149.
3. Anderson, M.M., and King, A.F., 1981, Precambrian tillites of the Conception Group on the Avalon Peninsula, southeastern Newfoundland, in Hambrey, M.J., and Harland, W.B. editors, Earth's pre-Pleistocene glacial record: Cambridge, England, Cambridge University Press, p. 760-767.
4. th Annual Meeting Guidebook, p. 145-164.
5. Bailey, R.H., Newman, W.A., and Genes, A., 1976, Geology of the Squantum "Tillite", in Cameron, B., editor, Geology of southeastern New England: New England Intercollegiate Geologic Conference, 68th Annual Meeting Guidebook, Princeton, New Jersey., p. 92-106.
6. Bailey, R.H., Skehan, S.J., J.W., Dreier, R.B., and Webster, M.J., 1989, Olistostromes of the Avalonian terrane of southeastern New England, in Horton, J.W., and Rast, N., editors, Mélanges and olistostromes of the U.S. Appalachians: Boulder, Colorado, Geological Society of America Special Paper 228, p. 93-112.
7. Barr, S.M., and White, C.E., 1996, Contrasts in Late Precambrian-early Paleozoic tectonothermal history between Avalon composite terrane sensu stricto and other possible peri-Gondwanan terranes in southern New Brunswick and Cape Breton Island, Canada, in Nance, R.D., and Thompson, M.D., editors, Avalonian and related peri-Gondwanan terranes of the circum-North Atlantic: Geological Society of America Special Paper 304, p. 95-120.
8. Bell, K.G., ms, 1948, Geology of the Boston metropolitan area : Ph.D thesis, Cambridge, Massachusetts Institute of Technology, 397 p.
9. Bell, K.G., and Alvord, D.C., 1976, Pre-Silurian stratigraphy of northeastern Massachusetts, in Page, L.R., editor, Contributions to the stratigraphy of New England: Geological Society of America Memoir 148, p. 179-216.
10. Benus, A.P., 1988, Sedimentological context of a deep-water Ediacaran fauna (Mistaken Point Formation, Avalon Zone, eastern Newfoundland), in Landing, E., Narbonne, G.M., and Myrow, P., editors, Trace fossils, small shelly fossils and the Precambrian-Cambrian boundary: New York State Museum/ Geological Survey Bulletin 463, p. 8-9.
11. Bevier, M.L., White, C.E., and Barr, S.M., 1990, Late Precambrian U-Pb ages for the Brookville Gneiss, southern New Brunswick: Journal of Geology, v. 98, p. 955-965.
12. Billings, M.P., 1929, Structural geology of the eastern part of the Boston Basin: American Journal of Science, series 5, v. 18, p. 99-137.
13. _ 1975, Geology of the North Metropolitan Relief Tunnel, Greater Boston, Massachusetts: Journal of the Boston Society of Civil Engineers, v. 62, p. 115-135.
14. _ 1976, Geology of the Boston Basin, in Lyons, P.C. and Brownlow, A.H., editors, Studies in New England Geology: Geological Society of America Memoir 146, p. 5-28.
15. Billings, M.P., Loomis, F.B., Jr., and Stewart, G.W., 1939, Carboniferous topography in the vicinity of Boston, Massachusetts: Geological Society of America Bulletin, v. 50, p. 1867-1884.
16. Billings, M.P., and Tierney, F.L., 1964, Geology of the City Tunnel Extension: Journal of the Boston Society of Civil Engineers, v. 51, p. 111-154.
17. Brueckner, W.D., and Anderson, M.M., 1971, Late Precambrian glacial deposits in southeastern Newfoundland, A preliminary note: Geological Association of Canada Proceedings, v. 24, p. 95-102.
18. Caldwell, D.W., 1964, The Squantum Formation: Palaeozoic tillite or tilloid?, in Skehan, S.J., J.W., editor, Guidebook to field trips in the Boston area and vicinity: Chestnut Hill, Massachusetts, New England Intercollegiate Geologic Conference, 56th Annual Meeting Guidebook, p. 92-106.
19. Claesson, S., Hannu, H., Kinny, P.D., and Williams, I.S., 1993, Svecofennian detrital zircon ages-implications for the Precambrian evolution of the Baltic shield: Precambrian Research, v. 64, p. 109-130.
20. Coats, R.P., 1981, Late Proterozoic (Adelaidean) tillites of the Adelaide Geosyncline, in Hambrey, M.J., and Harland, W.B., editors, Earth's pre-Pleistocene glacial record: Cambridge, Cambridge University Press, p. 537-548.
21. Colman-Sadd, S.P., Greene, B.A., and O'Driscoll, C.F., 1979, Gaultois map area: Newfoundland Department of Mines and Energy, Mineral Development Division, Open File Map 79-104.
22. Connelly, J.N., Åhäll, K.I., Berglund, J., and Larson, S.A., 1995, The Mesoproterozoic growth and Neoproterozoic modification of the SW Baltic Shield; timing, duration and trans-Atlantic correlations: Geological Society of America Abstracts with Programs, v. 27, no. 6, p 162.
23. Conway Morris, S., 1989, South-eastern Newfoundland and adjacent areas (Avalon Zone), Chapter 2, in Cowie, J.R. and Brasier, M.D., editors, The Precambrian-Cambrian Boundary: Oxford, Clarendon Press, p. 7-39.
24. Crosby, W.O., 1894, Geology of the Boston Basin; Hingham: Boston Society of Natural History Occasional Papers, v. 1, part II, p. 179-288.
25. Crowell, J.C., 1999, Pre-Mesozoic ice ages: their bearing on understanding the climate system: Geological Society of America Memoir 192, 106 p.
26. Dalziel, I.W.D., 1997, Overview-Neoproterozoic-Paleozoic geography and tectonics: review, hypothesis, environmental speculation: Geological Society of America Bulletin, v. 109, p. 16-42.
27. Dalziel, I.W.D., Dalla Salda, L.H., and Gahagan, L.M., 1994. Paleozoic Laurentia-Gondwana interaction and the origin of the Appalachian-Andean mountain system: Geological Society of America Bulletin, v. 106, p. 243-252.
28. Dodge, W.W., 1875, Notes on the geology of eastern Massachusetts: Boston Society of Natural History Proceedings, v. 17, p. 388-419.
29. Dott, R.E., 1961, Squantum "tillite", Massachusetts-Evidence of glaciation or subaqueous mass movements?: Geological Society of America Bulletin, v. 72, p. 1289-1306.
30. Edwards, M.B., and Foyn, S., 1981, Late Precambrian tillites in Finnmark, North Norway, in Hambrey, M.J., and Harland, W.B., editors, Earth's pre-Pleistocene glacial record: Cambridge, Cambridge University Press, p. 606-610.
31. Embleton, B.J.J., and Williams, G.E., 1986, Low palaeolatitude of deposition for late Precambrian periglacial varvites in South Australia; implications for palaeoclimatology: Earth and Planetary Science Letters, v. 79, p. 419-430.
32. Emerson, B.K., 1917, Geology of Massachusetts and Rhode Island: U.S. Geological Survey Bulletin 597, 289 p.
33. Eyles, N., and Eyles, C.H., 1989, Glacially-influenced deep marine sedimentation of the Late Precambrian Gaskiers Formation, Newfoundland, Canada: Sedimentology, v. 36, p. 601-620.
34. Fairchild, I.J., and Hambrey, M.J., 1984, The Vendian succession of northestern Spitsbergen: petrogenesis of a dolomite-tillite association: Precambrian Research, v. 26, p. 111-167.
35. Gardiner, S., and Hiscott, R.N., 1984, Sedimentology and basin analyses of the Precambrian Conception Group: Geological Survey of Canada, Paper 84-1a, p. 213-216.
36. _ 1988, Deep-water facies and depositional setting of the lower Conception Group (Hadrynian), southern Avalon Peninsula, Newfoundland: Canadian Journal of Earth Sciences, v. 25, p. 1579-1594.
37. Goldsmith, R., 1991, Stratigraphy of the Milford-Dedham zone, eastern Massachusetts: U.S. Geological Survey Professional Paper 1366E, p. E1-E62.
38. Gorbatschev, R., and Bogdanova, S., 1993, Frontiers in the Baltic Shield: Precambrian Research, v. 64, p. 3-21.
39. Grotzinger, J.P., Bowring, S.A., Saylor, B.Z., and Kaufman, S.J., 1995, New biostratigraphic and geochronologic constraints on early animal evolution: Science, v. 270, p. 598-604.
40. Harland, W.B., 1965, Critical evidende of a great infra-Cambrian glaciation: Geologische Rundschau, v. 54, p. 45-61.
41. Harland, W.B., Armstrong, R.A., Cox., A.V., Craig, L.E., Smith, A.G., and Smith, D.G., 1990, A geologic time scale 1989: Cambridge, England, Cambridge University Press, 263 p.
42. Hepburn, J.C., Hon, R., Dunning, G.R., Bailey, R.H., and Galli, K., 1993, The Avalon and Nashoba terranes (eastern margin of the Appalachian orogen in southeastern New England), in Cheney, J.T., and Hepburn, J.C., editors, Field Trip Guidebook for the Northeastern United States: Geological Society of America, Annual Meeting, Boston, v. 2, p. X1-X31.
43. Hermes, O.D., Gromet, L.P., and Murray, D.M., compilers, 1994, Bedrock geologic map of Rhode Island: Rhode Island Map Series, No. 1: Kingston, University of Rhode Island, scale 1:100,000.
44. Hermes, O.D., and Zartman, R.E., 1985, Late Proterozoic and Devonian plutonic terrane with the Avalon zone of Rhode Island: Geological Society of America Bulletin, v. 96, p. 272-282.
45. Hoffman, P.F., 1991, Did the breakout of Laurentia turn Gondwanaland inside-out?: Science, v. 252, p. 1409-1260.
46. _ 1999, Neoproterozoic low-latitude glaciation and the snowball Earth hypothesis: Geological Society of America Abstracts with Programs, v. 31, no. 7, p. A371-A372.
47. Hoffman, P.F., Hawkins, D.P., Isachsen, C.E., and Bowring, S.A., 1996, Precise U-Pb zircon ages for early Damaran magmatism in the Summas Mountains and Welsitschia inlier, northern Damara belt, Namibia: Geological Survey of Namibia, Communications, v. 11, p. 47-52.
48. Hoffman P.F., Kaufman, A.J., and Halverson, G.P., 1998a, Comings and goings of global glaciations on a Neoproterozoic tropical platform in Namibia: GSA Today, v. 8., no. 5, p. 1-9.
49. Hoffman, P.F., Kaufman, A., Halverson, G.P., and Schrag, D.P., 1998b, A Neoproterozoic snowball Earth: Science, v. 281, p. 1342-1346.
50. Hofmann, H.J., 1974, The stromatolite Archaeozoon acadiense from the Proterozoic Greenhead Group of Saint John, New Brunswick: Canadian Journal of Earth Sciences, v. 11, p. 1098-1115.
51. Hofmann, H.J., Hill, J., and King, A.F., 1979, Late Precambrian microfossils, Southeastern Newfoundland: Geological Survey of Canada Paper 79-1B, p. 83-98.
52. Irving, E., and Strong, D.F., 1985, Paleomagnetism of rocks from Burin Peninsula, Newfoundland: hypothesis of Late Paleozoic displacement of Acadia criticized: Journal of Geophysical Research, v. 90, no. B2, p. 1949-1962.
53. Jenkins, R.J. F., 1992, Functional and ecological aspects of Ediacaran assemblages, in Lipps, J.H., and Signor, P.W., editors, Origin and early evolution of the Metazoa: New York, Plenum Press, p. 131-176.
54. Johnson, R.J.E., and van der Voo, F., 1985, Paleomagnetism of the Late Precambrian Fourchu Group, Cape Breton Island, Nova Scotia: Canadian Journal of Earth Sciences, v. 23, p. 1673-1685.
55. Karabinos, P., and Gromet, L.P., 1993, Applications of single-grain zircon evaporation analyses to detrital grain studies and age discrimination in igneous suites: Geochimica et Cosmochimica Acta, v. 57, p. 4257-4267.
56. Kaufman, A.J., and Knoll, A.H., 1995, Neoproterozoic variations in the carbon istotope composition of seawater. Stratigraphic and biogeochemical implications: Precambrian Research, v. 73, p. 27-49.
57. Kaufman, A.J., Knoll, A.H., and Narbonne, G.M., 1997, Isotopes, ice ages and terminal Proterozoic Earth History: National Academy of Sciences Proceedings, v. 94, p. 6600-6605.
58. Kaye, C.A., 1980, Bedrock geologic map of the Boston North, Boston South and Newton Quadrangles: United States Geological Survey Map MF1241, scale 1:24,000.
59. th Annual Meeting Guidebook, p. 124-140.
60. Kaye, C.A., and Zartman, R.E., 1980, A Late Proterozoic Z to Cambrian age for the stratified rocks of the Boston Basin, Massachusetts in Wones, D.R., editor, The Caledonides in the USA: Blacksburg, Virginia Polytechnic Institute and State University Memoir 2, p. 257-261.
61. Kennedy, M.J., Runnegar, R., Prave, A.R., Hoffman, K.-H., and Arthur, M.J., 1998, Two or four Neoproterozoic glaciations?: Geology, v. 26, p. 1057-1184.
62. Keppie, J.D., 1992, Terranes in maritime Canada - one viewpoint, in Murphy, J.B., Barr, S.M., Currie, K.L., Keppie, J.D., Nance, R.D., and White, C.E., editors, The Avalon terrane in Maritime Canada: Geological Association of Canada, Wolfville, 1992, Fieldtrip Guidebook C-12 p. 9-62.
63. Keppie, J.D., Davis, D.W., and Krogh, T.E., 1998, U-Pb geochronological constraints on Precambrian stratified units in the Avalon Composite Terrane of Nova Scotia, Canada: tectonic implications: Canadian Journal of Earth Sciences, v. 35, p. 222-236.
64. Keppie, J.D., and Krogh, T.E., 1990, Detrital zircon ages from Late Precambrian conglomerate, Avalon composite terrane, Antigonish Highlands, Nova Scotia: Geological Society of America Abstracts with Program, v. 22, no. 2, p.27-28.
65. Kirschvink, J.L., 1992, Late Proterozoic low latitude glaciation: The snowball Earth, in Schopf, J.W., and Klein, C., editors, The Proterozoic biosphere: A multidisciplinary study: Cambridge, Cambridge University Press, p. 51-52.
66. Knoll, A.H., and Walter, M.R., 1992, Latest Proterozoic stratigraphy and Earth history: Nature, v. 356, p. 673-678.
67. Krogh, T.E., 1973, A low contamination method for hydrothermal decomposition of zircon and extraction of U and Pb for isotopic age determination: Geochimica et Cosmochimica Acta, v.37, p. 485-494.
68. _ 1982, Improved accuracy of U-Pb zircon ages by the creation of more concordant systems using an air abrasion technique: Geochimica et Cosmochimica Acta, v. 45, p. 637-649.
69. Krogh, T.E., Strong, D.F., O'Brien, S.J., and Papezik, V.S., 1988, Precise U-Pb zircon dates from the Avalon terrane in Newfoundland: Canadian Journal of Earth Sciences, v. 25, p. 442-453.
70. LaForge, L., 1932, Geology of the Boston area, Massachusetts: U.S Geological Survey Bulletin 839, 105 p.
71. Landing, E., 1996, Avalon: insular continent by the latest Precambrian, in Nance, R.D., and Thompson, R.D., editors, Avalonian and related peri-Gondwanan terranes of the circum-North Atlantic: Boulder, Colorado, Geological Society of America Special Paper 304, p. 29-63.
72. Landing, E., Bowring, S.A., Davidek, K.L., Westrop, S.R., Geyer, G., and Heldmaier, W., 1998, Duration of the early Cambrian: U-Pb ages of volcanic ashes from Avalon and Gondwana: Canadian Journal of Earth Sciences, v. 35, p.329-338.
73. Lenk, C., Strother, P.K., Kaye, C.A., and Barghoorn, E.S., 1982, Precambrian age of the Boston Basin: new evidence from microfossils: Science, v. 216, p. 619-620.
74. Ludwig K.R., 1988, ISOPLOT for MS-DOS: a plotting and regression program for radiogenic-isotope data for IBM-PC compatible computers: U.S. Geological Survey Open-File Report 88-557, 44 p.
75. Magee, C.W., and Gromet, L.P., 1996, Ages of detrital zircons from the Blackstone Group, RI: Insights into the history of the Esmond-Dedham terrane prior to 620 Ma: Geological Society of America Abstracts with Programs, v. 28, no. 3, p. 77.
76. McKerrow, W.S., Scotese, C.R., and Brasier, M.D., 1992, Early Cambrian continental reconstructions: Journal of the Geological Society of London, v. 149, p. 599-606.
77. Merriman, R.J., and Roberts, B., 1990, Metabentonites in the Moffat Shale Group, southern uplands of Scotland: geochemical evidence of ensialic marginal basin volcanism: Geological Magazine, v. 127, p. 259-271.
78. Myrow, P.M., and Kaufman, A.J., 1999, A newly discovered cap carbonate above Varanger-age glacial deposits in Newfoundland, Canada: Journal of Sedimentary Research, v. 69, p. 784-793.
79. Nance, R.D., and Murphy, J.B., 1994, Contrasting basement isotopic signatures and the palinspastic restoration of peripheral orogens: Example from the Neoproterczoic Avalonian-Cadomian belt: Geology, v. 22, p. 617-620.
80. _ 1996, Basement isotopic signatures and Neoproterozoic paleogeography of Avalonian-Cadomian and related terranes in the circum-North Atlantic, in Nance, R.D., and Thompson, M.D., editors, Avalonian and related peri-Gondwanan terranes of the circum-North Atlantic: Geological Society of America Special Paper 304, p. 333-346.
81. Narbonne, G.M., and Gehling, J.G., 1998, Is Aspidella the first described Ediacaran body fossil?: Geological Society of America Abstracts with Prorams, v. 30, no. 7, p. A233.
82. Narbonne, G.M., Kaufman, A.J., and Knoll, A.H., 1994, Integrated chemostratigraphy and biostratigraphy of the upper Windermere Supergroup (Neoproterozoic), northwestern Canada: implications for Neoproterozoic correlations and the early evolution of animals: Geological Society of American Bulletin, v. 106, p. 1281-1292.
83. O'Brien, S.J., O'Brien, B.H., Dunning, G.R., and Tucker, R.D., 1996, Late Proterozoic Avalonian and related peri-Gondwanan rocks of the Newfoundland Appalachians, in Nance, R.D., and Thompson, R.D., editors, Avalonian and related peri-Gondwanan terranes of the circum-North Atlantic: Boulder, Colorado, Geological Society of America Special Paper 304, p. 9-28.
84. O'Brien, S.J., O'Driscoll, C.F., Greene, B.A., and Tucker, R.D., 1995, Pre-Carboniferous geology of the Connaigre Peninsula and the adjacent coast of Fortune Bay, southern Newfoundland: Newfoundland Department of Natural Resources, Geological Survey Report 95-1, p. 267-297.
85. O'Brien, S.J., Tucker, R.D., and O'Driscoll, C.F., 1994, Neoproterozoic basement-cover relationships and the tectono-magmatic record of the Avalon zone type area (east Newfoundland: nature and significance: Geological Association of Canada Abstracts with Program, Annual Meeting, v. 17 p. A85.
86. O'Neill, P.P., 1991, Geology of the Weir's Pond area, Newfoundland (NTS 2/1): Newfoundland Department of Mines and Energy, Geological Survey Branch Report 91-3, 144 p.
87. Pell, S.D., McKirdy, D.M., Jansyn, J., and Jenkins, R.J.F., 1993, Ediacaran carbon isotope stratigraphy of South Australia-an initial study: Transactions of the Royal Society of Australia, v. 117, p. 153-161.
88. Pettijohn, F.J., 1957, Sedimentary Rocks: New York, Harper & Row, Publishers, 718 p.
89. Preiss, W.V., 1987, The Adelaide Geosyncline - Late Proterozoic stratigraphy, paleontology and tectonics: Bulletin of the Geological Survey of South Australia, v. 53, 438 p.
90. Quinn, A.W., 1971, Bedrock geologic map of Rhode Island: U.S. Geological Survey Bulletin 1295, 68 p.
91. Rahm, D.A., ms, 1959, Geology of the Main Drainage Tunnel, Boston, Massachusetts: Ph.D. Thesis, Harvard University, 101 p.
92. _ 1962, Geology of the Main Drainage Tunnel: Journal of the Boston Society of Civil Engineers, v. 49, p. 319-368.
93. Rast, N., O'Brien, B.H., and Wardle, R.J., 1976, Relationships between Precambrian and Lower Palaeozoic rocks of the 'Avalon Platform' in New Brunswick, the northeast Appalachians and the British Isles: Tectonophysics, v. 30, p. 325-338.
94. Rast, N., and Skehan, S.J., J.W., 1983, Evolution of the Avalonian Plate: Tectonophysics, v. 100, p. 257-286.
95. Rehmer, J.A., and Hepburn, J.C., 1974, Quartz sand surface textural evidence for a glacial origin of the Squantum "Tillite," Boston Basin, Massachusetts: Geology, v. 2, p. 413-415.
96. th Annual Meeting, Guidebook, p. 71-91.
97. Reusch, B.H., 1891, Sküringsmaerker og moraenagrums eftervist i Finmarker fra en periode meget neldre end "istiden": Norges Geologiske Undersøgelse, Arbok 1891, p. 75-85.
98. Richardson, S.M., 1977, Geology of the Dorchester Tunnel, Boston, Massachusetts: Journal of the Boston Society of of Civil Engineers, v. 63, p. 247-269.
99. Romer, R.L., and Smeds, S.A., 1994, Implications of U-Pb ages of columbite-tantalites from granitic pegmatites for the Paleoproterozoic accretion of 1.90-1.85 Ga magmatic arcs to the Baltic Shield: Precambrian Research, v. 67, p. 141-158.
100. Sayles, R. W., 1914, The Squantum Tillite: Bulletin of the Museum of Comparative Zoology at Harvard College: v. 56, no. 2, p. 141-175.
101. Sayles, R.W., and LaForge, L., 1910, The glacial origin of the Roxbury Conglomerate: Science, v. 22, p. 723-724.
102. Saylor, B.Z., Kaufman, A.J., Grotzinger, J.P., and Urban, F., 1998, A composite reference section for terminal Proterozoic strata of southern Namibia: Journal of Sedimentary Research, v. 68, no. 6., p. 1223-1235.
103. Schmidt, P. W., Williams, G.E., and Embleton, B.J.J., 1991, Low palaeolatitude of late Proterozoic glaciation; early timing of remanence in haematite of the Elatina Formatin, South Australia: Earth and Planetary Science Letters, v. 105, p. 355-367.
104. Schmidt, P.W., and Williams, W.E., 1995, The Neoproterozoic climatic paradox: equatorial paleolatitude for Marinoan glaciation near sea level in South Australia: Earth and Planetary Science Letters, v 134, p. 107-124.
105. Skehan, S.J., J.W., 1983, Relationship between Precambrian and lower Paleozoic rocks of southeastern New England and other North Atlantic Avalonian terranes in Schenk, P.E., editor, Regional Trends of the geology of the Appalachian-Caledonian-Hercynian-Mauritanide orogen: Dordrecht, D. Reidel Publishing Company, p. 131-162.
106. Smith, G.W., and Socci, A.D., 1990, Late Precambrian sedimentary geology of the Boston Basin, in Socci, A.D., Skehan, S.J., J.W., and Smith, G.W., editors, Geology of the composite Avalon terrane of southern New England: Geological Society of America Special Paper 245, p. 75-84.
107. Socci, A.D., and Smith, G.W., 1987, Recent sedimentological interpretations in the Avalon terrane of the Boston Basin, Massachusetts: Maritime Sediments and Atlantic Geology, v. 23, p. 13-39.
108. _ 1990, Stratigraphic implications of facies within the Boston Basin, in Socci, A.D., Skehan, J.W., and Smith, G.W., editors, Geology of the composite Avalon terrane of southern New England: Geological Society of America Special Paper 245, p. 55-74.
109. Sohl, L.E., 1999, Paleomagnetic evidence for Neoproterozoic low-latitude glaciation and implications for paleoclimate hypotheses: Geological Society of America Abstracts with Programs, v. 31, no. 7, p. A371.
110. Sorem, R.K., 1982, Volcanic ash clusters: tephra rafts and scavengers: Journal of Volcanology and Geothermal Research, v. 13, p. 63-71.
111. Stacey, J.S. and Kramers, J.D., 1975, Approximation of terrestrial lead isotope evolution by a 2-stage model: Earth and Planetary Science Letters, v. 26, p. 207-221.
112. Starmer, I.C., 1993, The Sveconorwegian orogeny in southern Norway, relative to deep crustal structures and events in the North Atlantic Proterozoic supercontinent: Norsk Geologisk Tidsskrift, v. 73 p. 109-132.
113. Stevens, L.M., ms, 1997, Westboro Formation, Saugus, MA: Petrography and detrital zircon geochronology: Senior honors thesis, Wellesley College, Wellesley, Massachusetts, 70 p.
114. Teixiera, W., Tassinari, C.C.G., Cordani, U.G., and Kawashita, K., 1989, A review of the geochronology of the Amazonian craton: tectonic implications: Precambrian Research, v. 42, p. 213-227.
115. Thompson, M.D., 1993, Late Proterozoic stratigraphy and structure in the Avalonian magmatic arc southwest of Boston, Massachusetts: American Journal of Science, v. 293, p. 725-743.
116. th Annual Meeting Guidebook, p. B1-1-B1-21.
117. Thompson, M.D., and Hermes, O.D., 1990, Ash-flow stratigraphy in the Mattapan Volcanic Complex, greater Boston, Massachusetts, in Socci, A.D., Skehan, J.W., and Smith, G.W., editors, Geology of the composite Avalon terane of southern New England: Geological Society of America Special Paper 245, p. 85-95.
118. Thompson, M.D., Hermes, O.D., Bowring, S.A., Isachsen, C.E., Besancon, J.B., and Kelly, K.L., 1996, Tectonostratigraphic implications of Late Proterozoic U-Pb zircon ages in the Avalon Zone of southeastern New England, in Nance, R.D., and Thompson, M.D., editors, Avalonian and related peri-Gondwanan terranes of the circum-North Atlantic: Geological Society of America Special Paper 304, p. 179-191.
119. Tierney, F.L., Billings, M.P., and Cassidy, M.M., 1968, Geology of the City Tunnel, Greater Boston, Massachusetts: Boston Society of Civil Engineers Journal, v. 55, p. 60-96.
120. Torsvik, T.H., Smethurst, M.A., Meert, J.G., van der Voo, R., McKerrow, W.S., Brasier, M.D., Sturt, B.A., and Walderhaug, H.J., 1996, Continental break-up and collision in the Neoproterozic and Palaeozoic; a tale of Baltica and Laurentia: Earth-Science Reviews, v. 40, p. 229-258.
121. Valbracht, P.-J., Oen, I.-S., and Beunk, F.-F., 1994, The Sm-Nd isotope systematics of 1.9-1.8 Ga granites from western Berglagen, Sweden; inferences on a 2.1-2.0 Ga crustal precursor: Chemical Geology, v. 112, p. 21-37.
122. van der Voo, R., 1993, Paleomagnetism of the Atlantic, Tethys and Iapetus Oceans: Cambridge, Cambridge University Press, 411 p.
123. Vidal, G., 1976, Late Precambrian microfossils from the Visingoe beds in southern Sweden: Fossils and Strata, v. 9, 57 p.
124. _ 1979, Acriarch and the correlation of the Upper Proterozoic: University of Lund, Sweden, Publications of the Institutes of Mineralogy, Palaeontology nd Quaternary Geology, no. 219, 22 p.
125. Wahlgren, C.H, Heaman, L.M., Kamo, S., and Ingvald, E., 1996, U-Pb baddeleyite dating of dolerite dykes in the eastern part of the Sveconorwegian Orogen, south-central Sweden: Precambrian Research, v. 79, 227-237.
126. Wardle, R.J., ms, 1978, The stratigraphy and tectonics of the Greenhead Group: its relationship to Hadrynian and Paleozoic rocks, southern New Brunswick: Ph.D. thesis, University of New Brunswick, Fredericton, 295 p.
127. Weisner, M.G., Wang, Y., and Zheng, L., 1995, Fallout of volcanic ash to the deep South China Sea induced by the 1991 eruption of Mount Pinatubo (Philippines): Geology, v. 23, p. 885-888.
128. White, C.E., and Barr, S.M., 1996, Geology of the Brookville terrane, southern New Brunswick, in Nance, R.D., and Thompson, M.D., editors, Avalonian and related peri-Gondwanan terranes of the circum-North Atlantic: Geological Society of America Special Paper 304, p. 133-147.
129. Williams, H., 1978, Tectonic-lithofacies map of the Appalachian orogen: St. Johns, Memorial University of Newfoundland Map No. 1, scale 1:1,000,000.
130. Williams, H., and King., A.F., 1976, Southern Avalon Peninsula: Trepassey Map-area: Geological Survey of Canada, Paper 76-1A, p. 179-182.
131. _ 1979, Trepassey map area, Newfoundland: Geological Survey of Canada Memoir 389, 24 p.
132. Winchester, J.A., and Floyd, P.A., 1977, Geochemical discrimination of different magma series and their differentiation products using immobile elements: Chemical Geology, v. 20, p. 325-343.
133. Wu, F., van der Voo, R., and Johnson, R.J.E., 1985, Eocambrian paleomagnetism of the Boston Basin: evidence for displaced terrane: Geophysical Research Letters, v. 13, p. 1450-1453.
134. Zartman, R.E., and Naylor, R.S., 1984, Structural implications of some radiometric ages of igneous rocks in southeastern Massachusetts: Geological Society of America Bulletin, v. 95, p. 522-539.
135. Zen, E-an, 1983, Bedrock geologic map of Massachusetts: Reston, Virginia, U.S. Geological Survey, 3 sheets, scale 1:250,000.