Abstract: Northwest-Dipping Bedding Thrust in Rondout Formation (U. Silurian), Ravena, NY: Implications for Extent of Post-Devonian Thrusts

G. M. Friedman, John E. Sanders

In the Blue Circle Atlantic Cement Co. quarry, Ravena, Albany Co., NY, a bedding thrust in the Rondout Formation (U. Silurian) dips NW, in the direction of the Catskills. Many similar bedding thrusts in the Siluro-Devonian strata are exposed in roadcuts and quarries; these have generally been interpreted as marking only local zones of adjustment during folding. The exposure at Ravena, however, taken together with previously published results, implies that prior to final folding, post-mid-Devonian thrusts involved all the Devonian strata in the region. The list includes closely folded strata preserved as outliers at Becraft Mountain and Mount Ida, those in what W.M. Davis called "The Little Mountains East of the Catskills," and even the flat-lying strata underlying the Cat kills themselves.

AAPG Search and Discovery Article #90954©1995 AAPG Eastern Section, Schenectady, New York