Maeyland Geological Survey 451 



2 S go 



*- c c 



Fissile green shale 100 18 



Green arenaceous shale breaking irregularly. Dip 38° E 70 42 

 Romney- Jennings contact 



RoMNEY Formation 

 Massive sandstone with imprints of Spirophyton sp. 



The characteristic features of the Jennings formation are well dis- 

 played in this section. The Eomney-Jennings contact is sharply shown. 

 The basal beds of the Woodmont member, containing the Naples fauna, 

 consist of interbedded olive-green iissile shales and thin flaggy sandstones. 

 The overlying beds carrying the Itliaca fauna consist more largely of 

 shale, which is softer and less distinctly fissile. The Parkhead sandstone 

 member contains three zones of conglomeratic sandstone. The lowest 

 conglomerate is inconspicuous and consists of a single stratum abounding 

 in Camaroto'chia congregata var. parlcheadensis, which is a most per- 

 sistent and valuable datum plane in all the eastern sections. The middle 

 conglomeratic sandstone is very massive and fonns the crest of the ridge. 

 The upper conglomeratic sandstone, which is thicker and more massive 

 here than at any other locality in the State, contains bluish-wliite quartz 

 pebbles often of large size. Because of its conspicuous character the 

 latter bed has been selected as the top of the Parkhead sandstone member 

 on the geological map of the region east of Sideling Hill. 



The Chemung sandstone member contains a very notable proportion of 

 red beds which make their appearance near the base of the Chemung 

 and are more conspicuous here than in any of the sections west of this 

 point. The massive sandstone beds forming the ridge in the center of the 

 syncline may represent the lower Chemung conglomerate (the Tropidolep- 

 tus conglomerate) of the most westerly sections. The upper conglomerate 

 of the Chemung is not exposed at this place but the massive sandstones 

 which represent it are to be seen south of the Potomac Eiver. 



