Abstract
In 1978 as chairman of the Geology and Geography Section of the American Association for the Advancement of Science (AAAS) I planned a program for the 1980 annual convention in San Franscisco, California. The 1980 program included Louis W. Alvarez (1911–1988) who reported that an asteroid 10 kilometers in diameter struck the earth at the end of the Cretaceous. This conclusion resulted from Alvarez and colleagues discovery in Gubbio, Europe, of a centimeter-thick clay layer among carbonate rock containing iridium, a siderophile element, at the Cretaceous-Tertiary boundary. Involvement in this discussion stimulated my interest in the study of Taconic carbonate deposits of my home and university setting in the Troy, New York and contiguous areas dating to the base of the Cambrian. Analyses of the New York carbonate samples gave comparable iridium results to those from the end of the Cretaceous in Europe. From these iridium anomalies I concluded that an extraterrestrial source, namely an asteroid, produced the iridium anomalies in the Cambrian of New York.
The studied Cambrian (Taconic) deposits of New York contain the highest87Sr/86Sr values of the past 2 b.y. Strontium is inferred to have been introduced by meteorite impact, yet meteorites generally have low 87/86 ratios. Stable isotope composition of the carbonate rock was likewise affected by meteorite impact. In summary the origin of the studied Cambrian carbonate deposits involved the “Cambrian Explosion”.
Similar content being viewed by others
References
ALVAREZ, L.W., ALVAREZ, W., ASARO, F., and MICHEL, H.V., 1980, Extraterrestrial cause for the Cretaceous-Tertiary Extinction:Science, v. 308, p. 1095–1108.
ALVAREZ, WALTER, ASARO, FRANK, and MONTANARI, ALESSANDRO, 1990, Iridium Profile for 10 million years across the Cretaceous-Tertiary Boundary at Gubbio (Italy):Science, v. 250, p. 1700–1701.
ARCHIBALD, J.D., 1996a, Dinosaur Extinction and the End of an Era: What the Fossils Say. New York, Columbia University Press, 237 p.
ARCHIBALD, J.D., 1996b, Testing extinction theories at the Cretaceous-Tertiary boundary using the vertebrate fossil record, In, MacLeod, N., and Keller, G., eds. The Cretaceous-Tertiary mass extinction: biotic and environmental changes. W. W. Norton & Co., New York, p. 373–398.
ARCHIBALD, J.D., 1996c, Dinosaur Extinction and the End of an Era: What the Fossils Say. In, Wolberg, D. L. and Stump, E., eds., Dinofest International: Symposium April 18–21, 1996, Program with Abstracts, Arizona State University, p. 25.
ARCHIBALD, J.D., 1996d, No statistical support for sudden (or gradual) extinction of dinosaurs. Reply:Geology, v. 24, p. 958–959.
BARTA, N.C., BERGSTRÖM, S.M., SALTZMAN, M.R., and SCHMITZ, BIRGER, 2007, First Record of the Orodovician Guttenberg δ13C Excursion (GICE) in New York State and Ontario: Local and Regional Chronostratigraphic Implications:Northeastern Geology and Environmental Sciences, v. 29, no. 4.
BIRD, J.M., and DEWEY, J.F., 1970, Lithosphere Plate-Continental Margin Tectonics and the Evolution of the Appalachian Orogeny:Geological Society of America Bulletin, v. 81, p. 1031–1060.
BOSWORTH, W.M. and VOLLMER, F.W., 1981, Structures of the Medial Ordovician flysch of eastern New York: deformation of synorogenic deposits in an overthrust environment:Journal of Geology, v. 89, p. 551–568.
BRUNS, P., DULLO, W.-C., HAY, W.W., WOLD, C.N., and PERNICKA, E., 1996, Iridium concentration as an estimator of instantaneous sediment accumulation rates:Journal of Sedimentary Research, v. 66, no. 3, p. 608–611.
BUCHER, W.H., 1957, Taconic klippe B a stratigraphic-structural problem:Geological Society of America Bulletin, v. 68, p. 657–674.
CHANDLEE, G.O., 2007, Book Review: Parker, Andrew, 2005, In the Blink of An Eye. Westview Press, Perseus Books Group, 237 p., $26.00:Houston Geological Society Bulletin, June.
DYKSTRA, J.C.F. and LONGMAN, M.W., 1996, Gas reservoir potential of the Lower Ordovician Beekmantown Group, Quebec Lowlands, Canada: Reply:American Association of Petroleum Geologists Bulletin, v. 80, no. 10.
FRIEDMAN, G. M., 1988, Slides and slumps:Earth Science, Fall, p. 21–23.
FRIEDMAN, G. M., 1995, Cambro-Lower Ordovician (Sauk) facies and sequences: Case history from eastern North America, p. 1–9in P.H. Pause and M.P. Candelaria, eds., Society of Economic Paleontologists and Mineralogists Permian Basin Section Publication 95-36 and Permian Basin Graduate Center Publication 5–95, xxx p.
FRIEDMAN, G.M., 1996, Strontium-Isotopic Signatures Reflect an Origin of Dolomite by Fresh-water Effluent: the Pine Plains Formation (Wappinger Group, Cambrian) of Southeastern New York:Carbonates and Evaporites, v. 11, no. 1, p. 134–140.
FRIEDMAN, G.M., 1998, Bolide Impact Terminating the Cambrian in New York. New York Academy of Science Flyer. Monday April 6, 1998, 7:30 pm.
FRIEDMAN, G.M., 1999, Impact from Space: A Historical Discussion:Earth Sciences History, v. 18, no. 2, p. 157–158.
FRIEDMAN, G.M., 2002, Highest Phanerozoic Strontium Isotopic Ratios of Pre-Rift Late Cambrian Passive Margin in New York State, USA: Products of Continental Weathering and Orogenesis:Sedimentology, v. 147, p. 143–153.
FRIEDMAN, G. M. and SANDERS, J. E., 1978, Principles of sedimentology: New York-Chichester-Brisbane-Toronto, John Wiley and Sons, 792 p.
FRIEDMAN, G.M. and SANDERS, J.E., 1984, Sedimentary environments in Paleozoic strata of the Appalachian Mountains in eastern New York:The Compass, v. 61, no. 4, p. 155–180.
FRIEDMAN, G.M., CHAKRABORTY, CHANDAN, and KOLKAS, M.M., 1996, δ13C Excursion in the End-Proterozoic Strata of the Vindhyan Basin (Central India): It’s Chronostratigraphic Significance:Carbonates and Evaporites, v. 11, no. 2, p. 206–212.
HOEFS, J., 1980, Stable isotope geochemistry. Springer-Verlag, Berlin, Heidelberg, 208 p.
KERR, R.A., 2001, Paring down the big mass extinctions:Science, v. 294, p. 2072–2073.
LAND, L.S., 1980, The isotopic and trace element geochemistry of dolomite: the state of the art:in D.H. Zenger, J.B. Dunham, and R.L. Ethingon, eds., Concepts and Models of Dolomitization: Society of Economic Paleontologists and Mineralogists (SEPM) Special Publication, no. 28, p. 87–110.
LOWMAN, S.W., 1962, Various Types of Breccias, Upper Ordovician to Lower Cambrian, near Troy, New York. Geological Society of America Special Paper, no. 68, p. 220–221.
MONTANEZ, I.P., BANNER, J.L., OSLEGER, D.A., BORG, L.F., and BOSSERMAN, P.J., 1996, Integrated Sr isotope variations and sea-level history of Middle to Upper Cambrian platform carbonates; implications for the evolution of Cambrian seawater87Sr/86Sr:Geology, v. 24, no. 10, p. 917–920.
POPP, B.N., PODOSEK, F.A., BRANNON, J.C., ANDERSON, T.F., and PIER, J., 1986,87Sr/86Sr ratios in Permo-Carboniferous sea water from the analyses of well preserved brachiopod shells:Geochimica et Cosmochimica Acta, v. 50, p. 1321–1328.
PROUTY, W.F., 1952, Carolina Bays and Their Origin:Geological Society of America Bulletin, v. 63, no. 2, p. 167–244.
SCHNEIDERMAN, N. and HARRIS, P. M., eds., 1985, Carbonate Cements, Society of Economic Paleontologists and Mineralogists Special Publication no. 36.
VEIZER, J., 1983, Trace elements and isotopes in sedimentary carbonates: in READER, R.J., editor, Carbonates: Mineralogy and Chemistry:Mineralogical Society of America, Reviews in Mineralogy, v. 11, p. 265–299.
WEAVER, J.D., 1957, Stratigraphy and structure of the Copake quadrangle, New York:Geological Society of America Bulletin, v. 68, p. 725–761.
ZENGER, D.H. and DUNHAM, J.B., 1980, Concepts and models of dolomitization. Society of Economic Paleontologists and Mineralogists Special Publication, no. 28.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Friedman, G.M. Explosive bolide impact designates the Cambrian Explosion, terminating the Cambrian event in New York. Carbonates Evaporites 22, 178–185 (2007). https://doi.org/10.1007/BF03176245
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF03176245