16 GEOLOGY OF ILLINOIS. 



and above it we fiud clay shale 2 feet, coal 10 inches, shale 5 to 6 

 feet, succeeded by the upper limestone which is here only three or four 

 feet thick. The upper limestone at the outcrop here is thinly and 

 unevenly bedded and weathers to a rusty- brown color. The lower lime- 

 stone is more heavily bedded, but splits to fragments on exposure to 

 frost and moisture. It is of a mottled gray color when freshly broken, 

 but weathers to a yellowish-brown. Fossils were not abundant in either 

 bed, but the lower afforded a few specimens of Athyris subtilita, a coral 

 like Heliophyllum, Productus costatus, and Terebratula bovidens. 



At Mr. Spangler's place, on sec. 12, in Melrose township (T. 9, 

 E,. 12), a hard, brittle, gray limestone outcrops on a branch of Mill creek. 

 The bed is about eight feet in thickness here, and is underlaid by a few 

 feet of partly bituminous shale and a thin coal from six to eight inches 

 thick. This is probably the same as the upper limestone at the old 

 Anderson mill, or No. 18 of the county section. The rock has been 

 quarried here for lime, and is said to yield a fair article. 



On sec. 5, T. 9, E. 10, Prof. Cox reports the following section : 



Ft. la. 



Co vered slop 20 



Gray shale and shaly sandstone - 10 



Limestone - 4 



Gray lossiliferous shale 6 



Coal (impure) ...6 in. to 1 



Black fire-clay G 



Gray shale to the hed of the creek 2 



The fossils observed here in the shale below the limestone were Pro- 

 ductus Prattenianus, P. semireticulatus ? P. punctatus, Chonetes mesoloba, 

 Hpirifer cameratus, Athyris subtilita, Lophophyllum proliferum, and Mya- 

 lina peruceformis. The limestone and coal of this locality probably 

 belong to Nos. 10 and 11 of the county section. 



At the railroad bridge north-west of Livingston the following section 

 may be seen : 



Ft. In. 



Gray sparry limestone 7 



Blue shale 6 



Gray limestone, heavy bedded 8 



Sandstone and sandy shale 30 to 40 



Thin coal (reported) C 



The upper bed of limestone (No. 18 of the county section,) is traversed 

 by veins of calcite and brown ferruginous streaks, that give the rock a 

 mottled appearance when freshly broken. The upper layer of the lower 

 bed is about thirty inches thick, and is a tough, compact, gray rock, 

 that breaks with an even surface and has a slightly granular or semi- 

 oolitic appearance. The lower part of this bed is a mottled-gray fine 

 grained limestone, and breaks with a more or less conchoidal fracture. 

 The fossils found in the limestone here were Athyris subtilita, Productus 

 costatus, P. Nebrascensis, Pinna per-acuta, Spirifer cameratus, S. piano- 



