| TABLE OF SEDIMENTARY STRATA, AND THE PLACE OF COAL AMONG THE ROCKS. | |||||||||||
| English equivalents. | Pennsylvania. | Nomenclature. | Maximum and minimum thickness. |
New York. | Missouri and Illinois. | Maximum and minimum thickness. |
Kansas and Colorado. | Maximum and minimum thickness. |
REMARKS. | ||
|
Drift, &c. | ? | Pennsylvania | Penn. and N. York | ? | Drift, &c. | 150 | ? | |||
| Tertiary | Absent | ? | Tertiary, no coal | 200 | Tertiary coal | ||||||
| Cretaceous | Absent | ? | Absent | 0 | Cretaceous | ||||||
| Oölitic | Absent | Absent | Absent | 0 | Oölitic | ||||||
| Triassic | Absent | Absent? | Absent | 0 | Triassic | ||||||
| Permian | New red sandstone | New red sandstone | Absent? | 0 | Permian | ||||||
250 to 1,500 250 to 1,000 ? 800 to 500 1,000 to 1,500
Containing lignite coal beds. Limestones and red sandstones. Richmond, Va., coal. Not investigated in the west. Containing gypsum, marls, &c., in Kansas and Colorado. Magnesian limestone.
PALÆOZOIC.
Carboniferous.
Coal measures Millstone grit Carboniferous limestones Sub-carboniferous
Coal measures Conglomerate Red shales White sandstones
XIII. XII. XI. X.
500 to 8,000 100 to 1,500 0 to 2,000 200 to 2,000
Absent Absent Absent Gray and white sandstones
Coal measures Millstone grit Carboniferous limestones
1,000 to 8,000 10 to 100 150 to 750
Concealed in Colorado by the tertiary. Occasionally seen in Colorado and Dakota.
Devonian
Old red sandstone. Eifel Eifel Ludlow
Red sandstones Limestones and shales Bituminous black slates Slates and sandstones
IX. VIII. VII. VI.
0 to 5,000 1,000 to 7,000 600 to 1,000 100 to 1,500
Catskill Chemung, Genesee, &c. Corniferous, Onondaga, &c. Oriskansy, sandtone, &c.
Bituminous slates, shales and limestones Oriskany
300 to 500 0 to 50
Not seen
?
Concealed or wanting in the far west.
U. Silurian
Wenlock Caradoc
Marls, shales and limestones Medina sandstones
V. IV.
1,000 to 4,000 200 to 2,500
Saliferous, Niagara, &c. Medina sandstone, &c.
300 to 700 ?
Not seen
?
Concealed by tertiary in Colorado.
Cambrian.
Bala rocks Festiniog group Lingula flags
Slates and limestones Limestones Slates and Potsdam sandstone
III. II. I.
500 to 2,500 1,000 to 6,000 1,000 to 4,000
Slates and limestones Limestones Calciferous Potsdam sandstone
Galena and magnesian limestones and calciferous sandstones Potsdam sandstone
300 to 1,000 100 to 250
Galena and magnesian limestone Potsdam sandstone
? 50 to 250
Occasionally seen in Colorado and Dakota, but generally concealed by the tertiary, &c.
Gneissic
Gneissic
5,000 to 10,000
Huronian gneissic
(Ozark) gneissic
500 to 1,000
(Rocky Mts.) gneissic
Metalliferous group of the Rocky mountains.
