Maryland Gkolooical Survey 143 



Horizontal Vertical Total 

 liistance thickness vertical 

 feet feet thickness 



Concealed 5.0 e8.9 



The remainder of the section is seen in the cut of the 

 Baltimore and Ohio Railroad east of the station. 



Massive blue limestone. Crinoids, Bryozoa 6.0 63.9 



Concealed 3.9 57.9 



Massive blue-gray limestone containing small Meri- 

 stella sp 4.6 54.0 



Heavy-bedded dark blue limestone weathering to a 

 light gray. Atrypa reticularis, Camarotachia litch- 

 fleldcvsis, Bryozoa 47.5 above base of Keyser, Camaro- 

 tarchia litchfieldensis, corals 2Q.2 ahowe ha.se 26.6 49.4 



Thin-bedded dark blue limestone weathering to a 

 gray, heavier bedded towards the middle and be- 

 coming thin-bedded again towards the bottom 10.6 22.8 



Shaly argillaceous limestone near the top, becoming 

 heavier bedded blue limestone towards the bottom. At 

 the top are found Stropheodonta Mpartita (c), and at 

 the bottom are found Spirifer modestus (c), Camaro- 

 toechia litclifieldensis (c) 12.2 12.2 



Thickness of Keyser member exposed 173.9 



To.N'OLowAY Formation 



Thin-bedded gray limestone 10.0 30.0 



Mostly concealed. Shaly gray limestone 20.0 20.0 



Spring. 



The following fossils have also been found in the Keyser in this section, 

 their precise horizon being unknown : Cyatliopliyllum clarlci. Holy sites 

 catenwlatus, Cyathophyllum schucherti, Gypidula subglolosa, Steno- 

 chisma formosa, Rhyjichospira forniosa. The Gypidula coeymanensis prog- 

 nostica zone is probably located about the top of the upper concealed unit. 

 The coral bed at the top of the exposure is believed to be the Keyser coral 

 bed. The profuse development of the Cladopora rectilinrata subzonc is a 

 conspicuous feature of the section. 



YI. Section at Miller's Spri?ig, West Virginia 



The Keyser limestone is exposed in a small quarry situated about one 

 mile south of Ridgely Station on the Western Maryland Railroad, on the 

 west side of Knobly Mountain. This quarry is south of the tunnel and just 

 to the east of the big spring, known as Miller's Spring. The limestone was 

 once quarried for the burning of lime. A heavy Stromatopora bed 15 feet 



