505 
STRATIGRAPHY OF THE POTOMAC GROUP 
COMPARATIVE TAONGMIC TABLE. 
CRETACEOUS 
JURASSIC ? 
——— 
( 
4 
Rogers’ tenn | eG, Pan eCiee | Repeee | ay, Sen Way ale WANE | ER Nee ED a aOUC i008 
(state (aren), Booth Tyson Cook | Whitfield |Newberry] McGee | Fontaine | Uhler Darton Marsh Ward 
report) 
? ? ? Alter- 
Raritan nate ee Albirupean 
E ] agot i 
Plastic | Raritan | Amboy : oy ae Zl ckee 
sands 
clays clays clays 
? ? 
Albiru- Potomac] Iron ore seri 
Upper | Jurasso-|Red clay} Varie- Potomac|Potomac] pean (gman. aN on Gee 
Patapsco| Secon- | Creta- | Forma- | gated or sic) dais 
dary ceous tion clays Younger Mite AVesaeGr 
(upper | and Meso- eee 
| secon- | sands zoic |Potomac}/Potomac R | 
dary) - appahannock 
Arundel Baltimo ScHesy 
nee James River 
series 
2 
Patuxent 
Tron ore 
clays 
? ? 
