Identifier: annualreport671913newy (find matches)
Title: Annual report
Year: 1902 (1900s)
Authors: New York State Museum
Subjects: New York State Museum Science Science
Publisher: Albany : University of the State of New York
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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one mass is known among the localquarrymen as the gray limestone. It has a pronounced crystallinetexture and, if it were white or bright colored, would pass in themarket as marble. It has a thickness varying in this vicinity from10 to 30 feet, and occurs in fairly heavy beds from 1 to 4 feet ormore in thickness. It is quite fossiliferous throughout the area, con-taining many well-preserved corals, crinoid stems, brachiopods, gas-tropods, bryozoans and trilobites. The corals are especially abundantso that in many places it suggests a coral plantation. The fossilsare calcite like that of the inclosing rock and are difficult to separatefrom the matrix without fracturing them. They are a little moreresistant to the agents of disintegration than the matrix, becomeeasily affected by secondary silicification and hence stand out inrelief on the weathered surfaces. The Onondaga limestone is the most durable rock in the sectionand hence stands out in bolder relief on the surface than any of the
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S.s jg o—! be oo 3 OS THE GEOLOGY OF THE SYRACUSE QUADRANGLE 23 others. Except where buried under the floor of Onondaga valleyand Butternut valley, it forms a continuous outcrop across the quad-rangle. In most places it is the top layer at the northern edge ofthe plateau escarpment, as in the steep cliffs around the Green lakeand Blue lake basins and along many of the deep depressions cutinto the plateau. In many places the upper surface of this rock freefrom any soil covering extends over a width varying from a fewfeet to several hundreds of feet back from the cliff edge. Theolder residual material was scraped off by the glacier and the sur-face washed clean by the glacial waters. There has been very littledisintegration from the temperature changes. Decay goes on almostentirely by solution and the rock is such a pure carbonate of limethat any slight residual matter left on the surface is washed awayby the rains. As in other limestone regions, disintegration has beenby the descendi

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