484 CLARK AND BIBBINS 
Patuxent. Compact, yellowish, reddish, and variegated sands, locally 
carbonaceous; brown clays containing flakes of iron ore 
(hydrous oxide); lead-colored clays with fragmentary plant 
remains; ferruginous ledge containing pipe ore. - - 30 ft 
Compact jointed clays of great variety of color, red, 
lilac, and white predominating; ‘‘ paint rock” and lenses of 
coarse gravel containing balls of clay and silicified conifer- 
ous wood, passing into - - = - - - - 20 ft 
Cross-bedded sand, slightly carbonaceous - - - 10 ft 
Total thickness, - - - - - 121 ft 
The slope of the hill is thickly covered with a wash com- 
posed of highly ferruginous sand charged with broken crusts of 
ironstone, 
Another section of much interest is found near Federal Hill 
Baltimore city, where the Patuxent sands are apparently directly 
overlain by the Patapsco formation, lenses of the Arundel for- 
mation having been observed occurring in their proper strati- 
graphic position in the immediate vicinity. The section at 
Federal Hill, somewhat generalized, is as follows: 
SECTION NEAR FEDERAL HILL, BALTIMORE CITY. 
Raritan. Sand and ferruginous sandstone containing silicified 
coniferous wood - - - - - =) 5 ftaomm' 
Carbonaceous clays containing flakes of “white ore” 1 ft. 4 in 
Patapsco. Variegated clays with ironstone crusts - - = By ite, © iim 
“Short” blue slickensides clay with logs of lignite 
and occasional fern impressions - - > 7p ittks © Was 
Fossiliferous “slaty clay,’’ with ferns, cycads, coni- 
fers, monocotyledons and dicotyledons - - - 7 ft. Io in. 
Indurated ferruginous layer containing “paint rock’’ _o ft. 6 in. 
Arundel. Represented in immediate vicinity by lenses of lig- 
nitic clay with nodules of “white ore” and its 
derivatives - - - - - - =) (outt) opm 
Patuxent. White sand - - - - - - - 7, eons 
Coarse sand with clay-balls — - - - - = AG te onins 
White clay - - - - - - - i sales () THN, 
Indurated gravel - - : - - - =) 9) ASE opine 
Total thickness - - - - - 76 ft. 8 in. 
