USGS6; Stratigraphic Contacts and Named/Unnamed Units					
Formation/Group	Stratigraphic unit	Top (ft)	Depth (ft)	Thick (ft)	Elevation (ft)
Dunkard Group		0.00	254.65	254.65	833.00
	Washington coal bed	127.82	137.23	9.41	705.18
	Waynesburg A coal bed	205.34	205.93	0.59	627.66
Monongahela Group		254.65	628.05	373.40	578.35
	Waynesburg coal bed	254.64	259.22	4.58	578.36
	Uniontown coal bed	375.29	375.32	0.03	457.71
	Sewickley coal bed	505.36	506.59	1.23	327.64
	Fishpot coal bed	526.44	526.44	0.00	306.56
	Redstone coal bed	590.47	593.32	2.85	242.53
	Pittsburgh coal bed	627.01	628.05	1.04	205.99
Conemaugh Group		628.05	1183.95(?)	555.90	204.95
	Little Pittsburgh coal bed	670.59	670.59	0.00	162.41
	Little Clarksburg coal bed	782.00	782.00	0.00	51.00
	Ames Marine Zone	887.70	889.03	1.33	-54.70
	Harlem coal bed	901.55	904.90	3.35	-68.55
	Bakerstown coal bed	1007.15	1007.15	0.00	-174.15
	Cambridge Marine Zone	1034.41	1034.82	0.41	-201.41
	Brush Creek Marine Zone	1069.74	1088.70	18.96	-236.74
	Brush Creek coal bed	1096.50	1097.94	1.44	-263.50
Allegheny Formation		1183.95	1439.80	255.85	-350.95
	Upper Freeport coal bed	1183.95	1183.95	0.00	-350.95
	Lower Freeport coal bed	1256.85	1259.43	2.58	-423.85
	Unnamed coal bed	1294.48	1294.48	0.00	-461.48
	Upper Kittanning coal bed	1316.30	1317.40	1.10	-483.30
	Middle Kittanning coal bed	1359.06	1362.88	3.82	-526.06
	Lower Kittanning coal bed	1376.71	1379.64	2.93	-543.71
	Clarion coal bed	1409.42	1411.56	2.14	-576.42
Pottsville Group		1439.80	1782.85	343.05	-606.80
	Homewood Sandstone	1439.80	1472.47	32.67	-606.80
	Upper Tionesta coal bed	1472.32	1473.01	0.69	-639.32
	Lower Tionesta coal bed	1478.58	1479.11	0.53	-645.58
	Upper Mercer coal bed	1483.90	1483.90	0.00	-650.90
	Upper Connoquenessing Sandstone	1505.63	1553.75	48.12	-672.63
	Quakertown coal bed	1563.92	1566.44	2.52	-730.92
	Sharon coal bed	1676.57	1678.06	1.49	-843.57
Mauch Chunk Formation		1782.85	1838.50	55.65	-949.85