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A clarification of the Triassic-Jurassic stratigraphic sequences, sedimentation, and depositional environments.
Clarification of Traiassic stratigraphic sequences and depositional environments.
Excerpt from Triassic Stratigraphy in the Northern Part of the Culpeper Basin, Virginia and Maryland A detailed stratigraphic study of the Triassic rocks in the Culpeper basin, which began in fall 1973, shows the need to change the nomenclature of these sedimentary rocks in the basin. These rocks, which make up the Newark Group, are redefined into the Manassas Sandstone, the Balls Bluff Siltstone, and the Bull Run Formation (pl. 1) on the basis of stratigraphic relation and depositional environment. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
The Mesozoic Era begins with the approximately 50-million-year-long Triassic Period, a major juncture in Earth history when the vast Pangaean supercontinent completed its assembly and began its fragmentation, and the global biota diversified and modern-ized after the end-Permian mass extinction, the most extensive biotic decimation of the Phanerozoic. The temporal ordering of geological and biotic events during Triassic time thus is critical to the interpretation of some unique and pivotal events in Earth his-tory. This temporal ordering is mostly based on the Triassic time-scale, which has been developed and refined for nearly two centu-ries. This book reviews the state of the art of the Triassic timescale and includes comprehensive analyses of Triassic radio-isotopic ages, magnetostratigraphy, isotope-based and cyclostratigraphic correlations and timescale -relevant marine and non-marine bio-stratigraphy.