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Pleistocene stratigraphy of the Boston Harbor drumlins, Massachusetts

Quaternary Research

By:
, , ,
DOI: 10.1016/0033-5894(90)90027-I

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Abstract

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. ?? 1990.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Pleistocene stratigraphy of the Boston Harbor drumlins, Massachusetts
Series title:
Quaternary Research
DOI:
10.1016/0033-5894(90)90027-I
Volume
34
Issue:
2
Year Published:
1990
Language:
English
Publisher:
Elsevier
Publisher location:
Amsterdam, Netherlands
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
148
Last page:
159
Number of Pages:
12