184 The Lower Devonian Deposits of Maryland 



in a low bank from 5 to 10 feet high, fossils can be seen in considerable 

 numbers and many perfect ones may be obtained. 



On the left side of the wagon road, just a few feet beyond the railroad 

 station, is a bank 20 feet or more high from which large collections have 

 been obtained. The formation here dips quite sharply to the eastward and 

 is apparently disintegrated throughout. It contains softer portions parallel 

 to the bedding, usually of small extent, but at times attaining considerable 

 dimensions, that are locally known as " sand-pockets." It is from these 

 that the beautiful specimens of the region are obtained. 



A few yards south of Ridgely the West Virginia Central Eailroad has 

 begun a cut through the ridge which has been left -unfinished. The sand- 

 pockets in this are numerous, sometimes containing fossils and sometimes 

 being perfectly barren. The fossils are very fragile with the tests thor- 

 oughly silicified. The extensive weathering which the Oriskany has under- 

 gone can be well seen here. In the center of the cut the beds are massive 

 and very calcareous. As they approach the surface on both sides of the 

 ridge they become porous, brown, poorly cemented sandstones. 



The northern end of Knobly Mountain gives the following species ob- 

 tained in the Eidgely member of the Oriskany: Spirifer arenosiis (aa), 

 S. murchisoni (a), 8. gordoni (r), S. cumherlandue (r), S. tribulis (r), 

 8. intermedins (a), 8. perdewi (r), Metaplasia pyxidata (r), M. lenti- 

 formis (rr), Anoplotheca flabellites (c), A. fimhriata (r), RensseJaria 

 rnarylandica (r), Beachia suessana (r), B. cumberlandice (r), B. ovalis 

 (rr), Oriskania lucerna (r), Eatonia peculiaris (aa), E. simmta (r), Fle- 

 thorhyncha speciosa (a), P. harrandii (rr), P. pleiopleura f (rr), Rhyn- 

 chotreta cumber! andica (rr), Camarota'chm oriskania (rr), Hipparionyx 

 proximus (rr) 8tropheodonla magnifica (r), aS. becki (rr), Schizophoria 

 oriskania (r), Rhipidomella musculosa (aa), Dalmanella planiconvexa 

 (r), Anomalocystites disparilis (r), TentacuUtes arenosus (rr), Platy- 

 ceras gebliardi (aa), P, ventricosum (aa), P. magnificum (c), P. tortuosum 

 (c) , P. reflexum {t),P. subconicum (c) , Diaphorostoma ventricosum (c), 

 CyrtoUtes (?) expansus (rr) , Dalmamtes sj). (rr) , Favosites coniciis (rr), 

 Edriocrinus sacculus (aa) Technocrinus spinulosus (rr), T. andrewsi 

 (r), T. striatus (rr), T. scvlpius (r). 



