660 CHARLES S. PROSSER 



Railroad in the southern part of Maryland, about thirteen miles 

 north of Martinsburg, proved more fossiliferous than those in 

 the vicinity of Martinsburg. 



i. The Pinesburg quarrv is on the Western Maryland Rail- 

 road, a' short distance west of the station. There is an exposure 

 of about fifty feet, the southern and higher part of the quarry 

 furnishing dimension stone which is dark blue to almost black 

 in color with banded layers of blue and bluish-gray and con- 

 tains fragments of trilobites, crinoid stems and some other 

 fossils, while the northern and lower part is used mainly for 

 ballast. The dip is 20° E. A view of this quarry is given in 

 Fig. 4. 



2. A. short distance to the east of the quarry is an excava- 

 tion in massive drab limestone, some of which before weathering 

 is dark in color, but afterward it is all a light gray. Fossils are 

 rare. Several specimens of Lcperditia, a Rhynchonella , a frag- 

 ment of a LeptcBiia similar to alternata and fragments of some 

 other fossils were found. 



3. On the railroad, between the quarry and the station, is a 

 small cut through thin bedded, dark blue, compact limestones 

 and some shaly layers. Fossils are common in some of these 

 layers and on one a large number of poorly preserved and 

 crushed specimens of Asaphns platycephalus Stokes were found. 

 The complete list of species found in this cut is as follows : 



t. As apkus platycephalus Stokes. 



2. Monticulipora (Prasopora) lycoperdon (Say). 



3 . Calymene callicephala Green ( ? ) . 



4. Lingula rectilateralis Emm.(?). 



5. Plectambouites sericea (Sowb.). 



6. Ortliis (Dalma/iella) testudinaria Dal. 



7. Rliy)ichotrema inceqirivalve (Castelnau) (?). 



The rock has been quite badly crushed, but in lithological 

 appearance it closely resembles the Trenton limestone in New 

 York. This limestone ledge is near the top of the Shenandoah 

 formation, for the Martinsburg shales occur only a short dis- 

 tance to the east by the side of the road at the Pinesburg station 



