Block Island fault: A Paleozoic crustal boundary on the Long Island platform

By: , and 



A major fault cutting through most of the crust can be identified and mapped on the Long Island platform using multichannel seismic reflection profiles and magnetic data. The fault, here called the Block Island fault (BIF), strikes north-northeast, dips westward at low angle, and does not resemble the thin-skinned thrust faulting observed in the foreland of the Appalachians. The BIF is located within the hinterland of the Appalachian mountain belt in the collision zone between Africa and North America. We present several interpretations but favor one in which the fault originated as an east-verging mid–late Paleozoic thrust fault, possibly related to the collision of Avalon or Meguma with North America. It was probably reactivated during early Mesozoic continental breakup and again in the Late Cretaceous and Tertiary, causing the steeply dipping postrift New Shoreham fault to form, either as an antithetic (normal) or splay (reverse) fault.

Publication type Article
Publication Subtype Journal Article
Title Block Island fault: A Paleozoic crustal boundary on the Long Island platform
Series title Geology
DOI 10.1130/0091-7613(1985)13<875:BIFAPC>2.0.CO;2
Volume 13
Issue 12
Year Published 1985
Language English
Publisher Geological Society of America
Contributing office(s) Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center
Description 5 p.
First page 875
Last page 879
Country United States
Other Geospatial Long Island platform
Online Only (Y/N) N
Additional Online Files (Y/N) N
Google Analytic Metrics Metrics page
Additional publication details