Stratigraphie distribution of carbohydrate residues in Middle Devonian Onondaga beds of Pennsylvania and western New York

Details Stratigraphie distribution of carbohydrate residues in Middle Devonian Onondaga beds of Pennsylvania and western New York Stratigraphie distribution of carbohydrate residues in Middle Devonian Onondaga beds of Pennsylvania and western New York

May 1966

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1966gecoa..30..497s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 30, Issue 5, pp.497-502

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Scientific paper

Average total carbohydrate content of limestones, shales and cherts of the Onondaga Group as determined by a eolorimetric phenol-sulfuric acid method is about 60 ppm, but significant variations occur. These variations are suggested to be due to differences in source material and conditions of deposition. An area of high concentration, up to 392 ppm, lies in northwestern Pennsylvania and another area up to 430 ppm occurs in Wyoming County, western New York. These areas may have received excessive contribution of organic matter from the cratonic land mass to the north, or from Sargasso-like floating vegetation. In Pennsylvania an area of low carbohydrate concentration adjoins the enriched belt on the east and is suggested to have been a shelf where scavenger activity was high. The average total carbohydrate content of 16 samples of dark shale and limestone from the type area in Devon, England, lithologically similar to the Onondaga is about 30 ppm. A range of 25-50 ppm total carbohydrates appears to be normal for the neritic Onondaga interbedded shale and limestone studied here and where significant departures from this range occur, unusual conditions of deposition or of post-depositional effects might be expected to have occurred. Individual monosaccharides analyzed chromatographically in one Onondaga sample consist of mannose, glucose and xylose. Glucose was confirmed enzymatically by use of a glucose-oxidase technique. The carbohydrate content of the middle and perhaps the lower Onondaga is somewhat higher than that of the upper Onondaga in the various facies which are represented in Pennsylvania and western New York. In general, it appears that residual organic compounds will be useful in other paleoenviron-mental and facies studies.

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