278 



Tlic tliickncss of llic Sloiics Kiv.-r liiiicstcnic incn'Mt 

 wMHl into Maryliiiid and IVmisylvania rcMcluii^' UHH\ i 

 hurjc-Cliamborsburi; (|uadraiij,'l('. In these states it oi 

 areas dne to the f^fciit ainciunt of fanltiui;, folding', an 

 and tliin-l)edded limestones interliedded witli niairnesii 



'U. S. Ceol. Survey Folio 170, p. 7. 

 colored purer limestones with consideraitle chert ciiaracterizes the formation 



litliolojjically. 



The followinsi fossils identified from collections made at Guilford Si)rings. 

 Pennsylvania, are from the dove-colored, cherty limestone mend)ers :' 



(lirrdiiclUi cf. <h(izii('iii<is. 



'I'd nidi inn xi/riiif/oporidcx. 



l/cbcrtclld Ixircdlis. 



llchcrtrUa niU/drix. 



I>i>i()rfhif< cf. itJatjix. 



SfrophomcHfi aff. eharlottae. 



Mavluritcs magn ux. 



Lophoxpira liicinctn. 



IxncliUina cf. ainitnin. 



Ainpn.!- lifilii. 



A com]>iirison of this list with those from the Stones River group In cen- 

 tral Tennessee indicates an etpiivalent age. 



Near Rellefonte. Pennsylvania. J. L. Collie-' has referred 253 feet of fos- 

 siliferous limestone to the Stones River. From the lower horizon of these 

 heds Kdthiirunix crtdiix. Strophophcma filitcrta and Protorhj/ncha r'uUcyana 

 were identified which correlates the hed with the Ridley limestone of Cen- 

 tral Tennessee. The heds above were regarded as of Lebanon age from the 

 occurrence of Lophoxpita nvillcri and tlie great abundance of Lepcrdifd 

 fiihiiUtcx. Below the Ridley beds and above the highest fossiliferous horizon 

 containing P.eekmantown species, there are 2335 feet of nnfos.siliferous dol- 

 omite the upper part of which may be equivalent in time to the ilurfrees- 

 boro and Pierce limestones of the Central P>asin area in Tennessee. 



Ed.'^tcni ycK- York ditd Wcxfcrn Vermont. Through the work of Raymond 

 and others upon the lower Chazy of New York and Vermont (Day Point and 

 Crown Point limestones), there is made available a considerable faunal 

 list which is puhlislKMl in P.ulletin r>2 of the United States National Mu.seum. 

 A (duipMrisdn of tiie ('.4 species from the Day Point limestone with other 

 Chazyan faunas shows that it is more closely related to the Appalachian 

 Stones River than to the limesttmes of the interior area. Cdindrelhi loufii- 

 roxfrix Pdllings. Hiididxfux f/loJioxiix (P.illings) Biicdnid xiilcaliiid Emmons. 

 hUiriichiUtid hitUiidriiiiidtd Raymond. Jlolopcd xcriitdtor Raynnmd. SccncJl<i 

 prcfcnxd Raymr)nd. StiiUirin parvd (Billings) are characteristic Chazyan 

 foiins of the Api>alachian-Chami)lain embayment and are found in the Day 

 Point limestone of New York and the T.enoir limestone of eastern Tennessee. 



The Crown Point limestones aiiparently lie conformably upon the Day 



lU. S. Gcol. Siirvpy F.ilio 170. p. 8. 

 =Geol. Soc. of Amor. (1908). 



