01118nas a2200145   4500008004100000245003900041210003900080300001400119490000700133520071000140653002500850100001800875700001900893856006000912       1937                        eng d00aEastern New York Ordovician Cherts0 aEastern New York Ordovician Cherts  a1535-15860 v473 a<p>After many years of study of the graptolite zones of the slate belt of eastern New York, Ruedemann became convinced that the bedded cherts represent more than a mere phase of the shale, and that the problem of their origin is one for detailed study, together with the question of the depth of deposition. Accordingly, their relative abundance, their stratigraphic position, their petrographic structure, and their paleontologic content have been the subject of special investigation. These studies disclose a radiolarian fauna in the chert, that suggests, for the chert and the accompanying graptolite shales, a syngenetic colloidal origin and deposition in the deeper reaches of the geosyncline.</p>
10ageology paleontology1 aRuedemann, R.1 aWilson, T., Y.  uhttp://gsabulletin.gsapubs.org/content/47/10/1535.short