109 



GALt. 



sequence above the Trenton formation (marked by its 6wn 

 characteristic fossils), underlaid by Ohazy and Oalciferous 

 Limestone strata several thousand feet thick. It is therefore 

 impossible to consider these trilobites as belonging to the Cam- 

 brian system. — II G^ nil). 



Calymene blumenbachii. Rogers, page 822 ; sometimes 

 in the Clinton formation, with G. clintoni ; 

 oftener in the Niagara formation. Figure 

 47 taken from Davidson's chart of British 

 trilobites.— 7 «, F5.— See Hall, Pal. N. Y., 

 vol. 2, p. 307, for a long list of European syno- 

 nyms, and references : C senaria ; (7. niag- 

 arensis ; Trilohites paradoxus ; Trilohus 

 tuberculatus ; EntomolitJius paradoxus (of 

 Linnaeus, 1759) ; Entomostracites tuber cula- 

 zv^L.MxcnvcnbcLcUv^ tus / aud OnisGus No, S (of Bechman, 1773.) 

 Calymene bufo. See Phacops bufo. VIII g, 

 Calymene calliGGphala. See Calymene senaria. II c. 

 Calymene clintoni. {Ilemierypterus elintoni.) Rogers, 



y page 823, fig. 673. Hall, 



^^^^^jjjlMs^ Fourth District, page 77, 

 ^^^^^ fig. 19, 2 (a tail piece). 

 }^^\3y^^0^ Vanuxem page 79, fig. 

 11,2. Clinton. — Claypole's lists of Perry 

 county fossils, Pa. Report F2, preface ; 

 abundant in Iron S>S., Ore SS., Ore Sand 

 vein and upper green shales of the 

 Clinton formation. — In Huntingdon Co. 

 and elsewhere it occurs in the fossil ore. 

 G7, p. 113, 232. In Lycoming Co., in 

 Clinton lower calc. shales, 5 m. below 

 Jersey Shore. Geol. Pa. 1858, Vol. 1, p. 536.— F^. 



Calymene erassimarginata. See Proetus crass. YIII a. 

 Calymene niagarensis. Hall, page 101, fig. 33, 3. Niagara 



H 33 formation. (Very like Calymene 

 senaria of the Trenton formation.) 

 The American variety of C blumen- 

 baohii. (Miller.) — Claypole's list. 

 F2. — Clinton Va; Niagara Vh. 



