University of New Hampshire University of New Hampshire Scholars' Repository New England Intercollegiate Geological NEIGC Trips Excursion Collection 1-1-1984 Boston Basin restudied Kaye, Clifford A. Follow this and additional works at: https://scholars.unh.edu/neigc_trips Recommended Citation Kaye, Clifford A., "Boston Basin restudied" (1984). NEIGC Trips. 348. https://scholars.unh.edu/neigc_trips/348 This Text is brought to you for free and open access by the New England Intercollegiate Geological Excursion Collection at University of New Hampshire Scholars' Repository. It has been accepted for inclusion in NEIGC Trips by an authorized administrator of University of New Hampshire Scholars' Repository. For more information, please contact
[email protected]. B2-1 124 BOSTON BASIN RESTUDIED Clifford A. Kaye U.S. Geological Survey (retired) 150 Causeway Street, Suite 1001 Boston, MA 02114 Abstract Recent mapping of the Boston Basin has shown that the sedimentary and rhyolitic and andesitic volcanic rocks are interbedded and that all lithic types interfinger, reflecting a wide range of depositional environments, including: alluvial, fluviatile, lacustrine, lagoonal, and marine-shelf. In addition to the well-known sedimentary rocks, such as argillite and conglomerate, we now recognize calcareous argillites, gypsiferous argillites of hypersaline origin, black argillite, red beds, turbidity current deposits, and alluvial fan deposits. The depositional setting seems to have been a tectonically active, block-faulted terrane in a coastal area. The granites that underlie these rocks are approximately the same age, some of them intruding the lower part of the sedimentary and volcanic section and feeding the rhyolitic Volcanics within the section. All of this took place in Late Proterozoic Z-Cambrian time.