STRATIGRAPHICAL ORDER. 53 
The relations of these elements to each other can be seen in the 
following diagram : 
Pittsburgh coal. 
Hintervaly.cccetsese ace ses San Anas Teen Sues dntae tc ttecenciasaeeshnweds 175 to 225 feet. 
Crinoidal limestone. 
inate ry ae ee ecst cone tsc nee cocente cnceesereacseeses tecccsiuedese acd 120 to 150 “ 
Brush Creek coal (Groff Vein). 
nT Genvaleee sees cerece octets seaet secede acnderoseceseesaesiteecaees 40 to 50 “ 
Upper Freeport coal (Big Vein). 
AS Tey RINE Eee SOE ca teetehis dee citcticcch coe e Denes ae cuewonblec doused Bia) (ia) (a0) 
Lower Freeport coal (Roger Vein). 
nate ryvall meters treeusesncecetawas sectelteciclesieeis(s seene (eeesle tases’) ease 40 to 55 “* 
Upper Kittanning coal (Eighteen-inch Seam). 
Tab Nav leer eet cen tewon eee eco cree itcmaeweeelscseresesSsecaseceeacesoses 30 to 40 * 
Middle Kittanning coal (Block Vein). 
NGC NeVt Pett eelee rons serccc cocci esiisucacseewssccsssecselcus'de sess vesees 18 to 30 * 
Lower Kittanning coal (Clay Vein or Creek Vein). 
Kittanning clay. 
The first section taken along this line is one mile below the mouth of 
Yellow Creek. The Middle Kittanning coal here lies at railroad grade. 
The Roger coal is opened 72 feet above it. The blossoms of the Big 
Vein and the Groff Vein are seen at the proper elevations. The whole 
section is as follows: 
Brush Creek coal—blossom. 
Hintenvalliceccccss<cssccesctaccecesscessees 600000000000000000000 50 feet, approximate. 
Upper Freeport coal—blossom. 
TIM COnVialhescee stecccec cscs cs cesesscneccvecrseccucccsccttscscocees 
Lower Freeport coal. 
internvialeecc.scccccecccseeccsscen, ssvdesscsesese suse ees 9006000806 1. 02 
Middle Kittanning coal—level of railroad. 
60 “ approximate. 
66 
At Port Homer a larger section is obtained. It is as follows: 
Crinoidal limestone. 
Tm Cervial eccscsscccenacten se eem cee ee eke hee cde ee ead d es dilate delet Sncektte Cree 180 feet. 
Coal, thin, 6 inches. 
MM Corvallis ic scccecerscenessibeccisesssshevecess Tee avesesccecsees ACO CCCHHGOAD 28, SS 
Brush Creek coal, Groff Vein—blossom. 
MN COT Vee cnen cocon stone cc nact nesses eeu c owen owse Nene sees oa saves see vecoewee’s Bigs 
Upper Freeport limestone, 2 feet. 
VITAE AE latsbanoccesuenacadeodcROne eres HEEHERE RE Pan HEME seseeaceecesvesceene 138 “ 
Lower Kittanning coal, 2 ft. 6 in. (7 ft. below railroad). 
