Marylaxd Geological Survey 77 



No fossils were found. On tlie eastern side of Big Spring Eun at the 

 highway crossing some 3 miles northwest of Oldtown, are very smooth, 

 black, argillaceous shales, agreeing in lithologic appearance with the 

 Marcellus shales. One layer is thicker and somewhat arenaceous. The 

 dip is between 43° and 45° nearly S. E., and no fossils were found. This 

 locality is near the southern end of Warrior Jlountain and not far 

 from the Oriskany sandstone which was brought up by that uplift. 

 Farther up the run on its southern bank are bluish-black shales which, 

 on weathering, break into rectangular pieces and become rusty brown in 

 color. This outcrop occurs after crossing the axis of Warrior Mountain 

 and on its western side with a dip of between 9° and 10° S. The rocks 

 are probably in the lower part of the Hamilton stage. 



On the road east of Pine Hill, about 4 miles north of Oldtown, the fol- 

 lowing species were coilected by O'Harra: Stropheodonla {Leptostrophia) 

 perplana (Conrad), Chonetes mucronatus Hall, Camarotoechia pi-olifica 

 Hall, Eunella linclclaeni Hall, Tropidoleptiis carinaius (Conrad), Cijrtina 

 harniltoncnsis Hall, Spirifer mucronatus (Conrad), Spirifer granulosus 

 (Conrad), Actinopieria decussata Hall, Bellerophon sp., Bellerophon 

 brevilineatus Conrad (?), CijrtoUtes {Cyrtonella) mitella Hall (?), 

 Orthoceras hehryx Hall (?), Orthoceras cf. auJax Hall, Ilomalonotus 

 dekayi (Green) , Phacops rana (Green). 



The following specimens are in the Johns Hopkins University collec- 

 tion from the Hamilton of western Maryland but without exact locality 

 labels: Schuchertella sp., Camarotoechia congregata (Conrad), Camaro- 

 toechia sappho Hall, Cyrtina hamiltonensis Hall, Spirifer audaculus 

 (Conrad), Ambocoelia umlonata (Conrad), Nucula sp., Tancrediopsis 

 clarkei Prosser, Modiomorpha concentrica (Conrad), Paracyclas lirata 

 Conrad, rieuroto7naria itys Hall ( ?}, Dellerophoii (PateUostlam) paluJiis 

 Hall (?), Macrochilus hamiltoniae Hall, Spyroceras crotahim (Hall), 

 cf. Gomplioceras pinyiie Plall. 



Exposure West of Tonoloivay Ridge. — In Washington County are several 

 areas of Romney rocks, mainly narrow belts crossing the county in a 

 direction about northeast to southwest from Pennsylvania to West Vir- 

 ginia. The most western belt in the county is the one to the west of 



