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Structural history of Triassic rocks of the Connecticut Valley belt and its regional implications


, : Structural history of Triassic rocks of the Connecticut Valley belt and its regional implications. Transactions of the New York Academy of Sciences 23(2): 119-132

The structural history of the Triassic rocks of central Connecticut is based on interpretation of the stratigraphy and present attitudes of the strata. Boulder conglomerates adjacent to the NNE.-SSW.-trending border fault testify to syndepositional movement on the border fault during the upper Triassic. After deposition, the strata were tilted to the ESE. and also warped into a series of anticlines and half basins whose axes strike NW.-SE. and plunge toward the border fault. These warped structures, which involve the underlying pre-Triassic "basement," are limited to elongate blocks that are bounded on each side by a fault; they have also been displaced by another set of faults (lowland fault system) into which have been injected late basaltic dikes. The Connecticut Valley belt of Triassic rocks ends on the S. in New Haven harbor where the pre-Triassic "basement" surface at the base of the Triassic, dipping steeply ENE., strikes directly into the border fault. A similar history is indicated for the New York-New Jersey belt of Triassic rocks but with dip of strata toward the NW. into a SE.-dipping border fault. The NW.-dipping New York-New Jersey belt and SE.-dipping Connecticut Valley belt together define a regional arch whose axis crosses western Connecticut. The New York-New Jersey belt of Triassic rocks ends N. of Stony Point W. of Peekskill, New York, where the pre-Triassic "basement" surface, dipping SW., strikes into the border fault. The mirror symmetry of the surface of the basement at the southwestern end of the Connecticut Valley belt and northeastern end of the New York-New Jersey belt defines a major NW.-SE.-trending regional anticline whose axis is parallel to those of the other warped structures in the Triassic rocks of both areas and that extends from the border fault in Connecticut to the border fault in southern New York. This Danbury anticline (new name) intersects the NE.-SW.-trending regional arch near Danbury, Connecticut, in an area where positive gravity anomalies of 35 milligals have been found. The reported occurrence of Triassic rocks in a deep well under the coastal plain cover of Long Island is explained as a remnant of a SE.-dipping belt that lies E. of the NE.-SW.-trending regional arch and SW. of the Danbury anticline. The absence of Triassic rocks under Long Island Sound, indicated by seismic traverses, is explained by the existence there of the broad crestal area of the Danbury anticline.

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