Abstract
Abstract The Shawangunk Formation, a quartz pebble conglomerate of Middle Silurian age, extends from the lower mid-Hudson Valley through New Jersey and into Pennsylvania. It overlies the Ordovician Martinsburg Formation, which is composed of shales and graywackes. The Martinsburg crops out on the Shawangunk Ridge and is quarried by Mohonk Mountain House in New Paltz, NY, in order to prevent erosion and provide good footing on the trails. The quarry, locally known as the “Shale Bank”, contains a diverse marine fauna of brachiopods, crinoids, bivalves, ostracods, corals, trilobites, and conulariids. In this community, the partition of feeding niches results in a reduced competitive trophic structure and therefore increased community stability. Within the Shawangunk Formation, there are rare “pods”, domelike structures that are filled with a gray matrix of rounded quartz grains supported by a clay matrix. The pods appeared to have formed along cleavage surfaces. A previously unrecognized metal sulfide deposi...
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