Maryland Geological Survey 85 



No. 7. Below the grit of tlie previous zone is dark blue limestone 

 containing quite large masses of blackish chert. During low water 4 feet, 

 3 inches of this zone is shown to the level of Licking Creek. 



The contact of the Oriskany and Eomiiey is also shown in the aban- 

 doned quarry to the east of the bridge on the northern side of the creek. 

 At the top of the Oriskany is a conglomeratic layer, with a thickness of 

 8 inches, in which are large and numerous quartz pebbles. Above this is 

 a shaly layer containing a good many pebbles and this is regarded as a 

 basal conglomerate of the Romney formation. 



As has been already stated the conglomerate at the top of the Oriskany 

 sandstone indicates shallow water and shore conditions which were prob- 

 ably followed by a land area. This land area evidently continued for a 

 time preceding the formation of the Onondaga shale, when a subsidence 

 occurred and the basal conglomerate of the Romney formation was 

 deposited. The Warren Point conglomerates were discovered Ijy Dr. 

 Eowe who first called attention to the evidence of unconformity at this 

 locality between the Oriskany and Romney formations. Farther soutli- 

 ward, in Virginia, Darton described an erosional unconformity between 

 the Monterey (Oriskany) and Romney formations, especially in the 

 region to the west of Staunton.' 



Exposure at Ernstville. — -By the roadside in Ernstville, to the southeast 

 of Licking Creek, are exposures of fine, blue shales which split irregularly 

 and are quite arenaceous. They contain a considerable fauna composed 

 of Phacops rana (Green), Chonetes coronatus (Conrad), and other species 

 as listed below: Stereolasma rectum (Hall), HeliophyUum sp., Orhicu- 

 loidea lodiensis var. media Hall, Craniella sp., Leptaena rhomhoidalis 

 (Wilckens), Chonetes coronatus (Conrad), Chonetes cf. scitulus Hall, 

 Chonetes setiger (Hall) (?), Productclla (?) schucherii Prosser, Khipi- 

 domella cf. vanuxemi Hall, RhipidomcUa cyclas Hall (?), Schizophoria 

 striatula (Schlotheim) {?) , Amhocoelia umhonata {QonrSiA) , AmhocoeVia 

 praeuinbona Hall (?), Nucleospira concinna Hall, Nucula corbiilifonnis 

 Hall, Nuculitcs ohiongatus Conrad, Parallelodon liatniltonia-e (Hall), 



' Am. Geol., Vol. X, 1892, p. 16. 



