TY - JOUR
T1 - Pleistocene stratigraphy of the Boston Harbor drumlins, Massachusetts
AU - Newman, William A.
AU - Berg, Richard C.
AU - Rosen, Peter S.
AU - Glass, Herbert D.
N1 - Funding Information:
This research was supported in part by a grant from Northeastern University. We thank Ms. Meribah Stanton, Director, Long Island Hospital, and Ms. Sue Heilman, Executive Director, Thompson Island Education Center, for permission to examine the exposures on those islands. We also thank the Massachusetts Department of Environmental Management and the Metropolitan District Commission for permission to visit, measure, and sample drumlin sections on their administered islands. We also thank Ms. Laura Toal-son and Ms. Barbara Stiff of the Illinois State Geological Survey for drafting figures and tables.
Copyright:
Copyright 2014 Elsevier B.V., All rights reserved.
PY - 1990/9
Y1 - 1990/9
N2 - Evidence from the Boston Harbor drumlins indicates that two superposed tills were deposited during glacier advances which were separated by a long nonglacial interval. At Long and Peddocks Islands, argillans and truncated clay-filled fractures, along with discontinuities in clay-mineral composition, define the till contacts. Physical indicators separating the tills are not apparent at other exposures, where till boundaries were defined solely by discontinuities in clay-mineral composition. The weathering profile in the upper part of the lower till indicates extensive weathering under a climate similar to that of today, and probably similar to that of the Sangamon Interglaciation. The depth of the weathering profile, the sequence of clay-mineral alteration products, and the presence of pedogenic features in the upper part of the lower till are comparable to Sangamonian weathering profiles in the midwestern United States, implying that the lower till is Illinoian or older.
AB - Evidence from the Boston Harbor drumlins indicates that two superposed tills were deposited during glacier advances which were separated by a long nonglacial interval. At Long and Peddocks Islands, argillans and truncated clay-filled fractures, along with discontinuities in clay-mineral composition, define the till contacts. Physical indicators separating the tills are not apparent at other exposures, where till boundaries were defined solely by discontinuities in clay-mineral composition. The weathering profile in the upper part of the lower till indicates extensive weathering under a climate similar to that of today, and probably similar to that of the Sangamon Interglaciation. The depth of the weathering profile, the sequence of clay-mineral alteration products, and the presence of pedogenic features in the upper part of the lower till are comparable to Sangamonian weathering profiles in the midwestern United States, implying that the lower till is Illinoian or older.
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U2 - 10.1016/0033-5894(90)90027-I
DO - 10.1016/0033-5894(90)90027-I
M3 - Article
AN - SCOPUS:0025589174
VL - 34
SP - 148
EP - 159
JO - Quaternary Research (United States)
JF - Quaternary Research (United States)
SN - 0033-5894
IS - 2
ER -