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Beacon Hill end moraine, Boston; new explanation of an important urban feature

C. A. Kaye
Beacon Hill end moraine, Boston; new explanation of an important urban feature
Special Paper - Geological Society of America (1976) (174): 7-20

Abstract

The usefulness of geology to engineers is in direct proportion to how well it helps us predict the subsurface; these predictions, in turn, depend on our knowledge of the geomorphic processes that molded the terrain. The uncertainties of interpretation are particularly great in glaciated terrain because our understanding of both glacial processes and history is so incomplete, a fact well illustrated in Beacon Hill. Recent construction activities in the eastern part of the hill, until now classified as a drumlin, have shown that it is better interpreted as an end moraine formed by a Wisconsinan glacial readvance. Instead of the firm till that was anticipated as foundation material, excavations exposed a complex of sand, gravel, and clay, with only minor zones of till. The structure of these deposits strongly suggests that originally they were plates of the glacial bed that froze to the glacier and were transported englacially. Thrust faulting and other deformations are glacial structures formed within the ice in the glacier"s terminal zone. In spite of the complex englacial history, these deposits lost little of their original appearance and intergranular relationships. Upon deglaciation, the frozen moraine thawed, and slumping formed complex secondary structures on the ridge"s lower flanks.


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Issue: 174
Serial Info: Urban geomorphology
Title: Beacon Hill end moraine, Boston; new explanation of an important urban feature
Author(s): Kaye, C. A.
Affiliation: U. S. Geol. Surv., Boston, Mass., United States
Pages: 7-20
Published: 1976
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
Accession Number: 1977-005334
Categories: Quaternary geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. tables, sketch map
N42°19'60" - N42°19'60", W71°04'60" - W71°04'60"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 1977
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