. Bulletins of American paleontology. New York Devonian Brachiopods: Feldman ded, the Moorehouse, 11 m thick, is a medium-gray, fine-grained micritic Hmestone with abundant dark- weathering chert. During Moorehouse time, there ap- parently were shallowing conditions similar to those that prevailed during Edgecliff-Clarence time (Kissling and Moshier, 1981). The top of the Moorehouse is marked by the occurrence of the Onondaga Indian Na- tion metabentonite (= Tioga B metabentonite) which is not always present in the various quarries visited. Most of the brachiopods studied in the Onondaga in th
. Bulletins of American paleontology. New York Devonian Brachiopods: Feldman ded, the Moorehouse, 11 m thick, is a medium-gray, fine-grained micritic Hmestone with abundant dark- weathering chert. During Moorehouse time, there ap- parently were shallowing conditions similar to those that prevailed during Edgecliff-Clarence time (Kissling and Moshier, 1981). The top of the Moorehouse is marked by the occurrence of the Onondaga Indian Na- tion metabentonite (= Tioga B metabentonite) which is not always present in the various quarries visited. Most of the brachiopods studied in the Onondaga in the last decade were recovered from the Moorehouse Member due, in part, to accessibility of the fossils. Seneca Afeftiher.âThe base of the Seneca Member (4 m thick in western New York) is marked by the "Tioga B" ash layer (about 15 cm thick). The Seneca is a medium- to dark-gray, light-weathering wacke- stone, sparsely fossiliferous, with occasional chert nod- ules throughout. The "Pink Hallinetes Zone" (= Zone J of Oliver, 1954), 3 m above the ash layer and m thick, is a thinly bedded limestone packed with cho- netid brachiopods many of which are stained pink. At most localities in western New York, a bed of chert can be found about 15 cm below the top of Zone J. The upper part of the Seneca is more argillaceous and distinctly darker in appearance and is capped by a bone bed making the contact with the overlying basal Ham- ilton Group (Oatka Creek Shale) sharply defined in most places. During Onondaga time there was a general increase in water depth throughout the basin as indicated by a gradual northward shift of all carbonate facies com- prising the successive members and by northward mi- gration with time of the Marcellus Shale (Kissling and Moshier, 1981). According to Woodrow et al. (1989), the Moorehouse-to-Seneca stratigraphic succession represents a major transgression, with the upper Moorehouse and lowermost Seneca aerobic facies passing upwards
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