﻿SCHUCHERTJ 



SILURIC AND DEVONIC CYSTIDEA 2 °3 



the pieces with iron forceps, not with the fingers. In cleaning fossils 

 have the parts to be acted on uppermost, and on these lay small pieces 

 of solid caustic potash. After the potash lias acted for a day or so 

 wash the dirt away which rises in puffed masses, and continue the 

 application of fresh potash until the parts are cleaned. To get rid 

 of all potash, which if not removed will for years after come to the 

 surface in a white film, soak the fossils in many changes of water 

 to which has been added a few drops of muriatic acid, and brush r< 

 peatedly. Sometimes the white film is a product of decomposition 

 and cannot he wholly removed. It can then he darkened with india 

 ink or some suitable color." 



The cystid fauna continues through about ij feet of shale and is 

 then suddenly terminated by a heavy bedded impure limestone in 

 which Camarocrinus abounds. In no other place have these forms 

 been found in abundance, though occasionally a specimen is picked 

 up at Devil's Backbone, Cash valley, and in the city of Cumber- 

 land. For the sake of completeness the detail of the Manlius forma- 

 tion, as exposed in the quarries near Keyser, is here presented: 



Section of Manlius Formation at B. & O. R. R. Ballast Quarries near 

 Keyser, West Virginia. 1 



Coevmans limestone. Base of Devonic : 



Ft. In. 



6. Heavy-bedded solid blue limestone. No fossils seen 34 6 



5. A solid blue limestone, filled with a small form of 



Gypidula near G. galcata 2 



4. Heavy-bedded impure limestone, with an abundance of 

 Camarocrinus and more rarely Tentaculites gyra- 

 canthus, Calymmene camerata, and Trimerocystis pe- 

 culiaris " 



3. Cystid beds. Thin-bedded shaly limestone and shale, 

 deeply weathered. Throughout this zone Sphcero- 

 cystites multifasciatus, S. globularis, Pseudocrinites 

 gordoni, and Jaekelocystis hartleyi abound. Pseu- 

 docrinites stellatus, P. clarki, P. perdewi, Jaekelo- 

 cystis papillatus, J. avellana, Lepocrinites man'ius, 

 and Tetracystis chrysalis occur more rarely 37 



2. A solid blue limestone 2 4 



1. Thin-bedded shaly limestone like 4. Toward the base 

 occur Nucleospira, Rhynchonella like campbellana, 



and Spirifer octocostatus 28 6 



Salina formation, 1125 feet: 



1 See also Schuchert, Proc. U. S. Nat. Mus., xxvi, 1903, pp. 4i3~424- 



