J. A. Rehmer, J. Christopher Hepburn; Quartz Sand Surface Textural Evidence for a Glacial Origin of the Squantum “Tillite,” Boston Basin, Massachusetts. Geology ; 2 (8): 413–415. doi: https://doi.org/10.1130/0091-7613(1974)2<413:QSSTEF>2.0.CO;2
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Scanning electron microscopy (SEM) of quartz sand grains separated from the Squantum “Tillite” reveals surface textures characteristic of those acquired during glacial transport. This evidence supports past theories of a middle to late Paleozoic mountain glaciation in the Boston area.