14 Notes on the Coal Measures of 



PODICIPID.E. The Grebes. 



212. Podiceps occidentalis Lawr. Western Grebe. Common. Prob- 

 ably breeds. 



213. Podiceps comutus (Gra.). Horned Grebe. Rather common in 

 fall. 



214. Podilymbus podiceps (L.) . Carolina Grebe. Common in fall. 



II. — Notes on the Coal Measures of Beaver County, Penn- 

 sylvania. 



by j. c. white. 



Read March 16th, 1874. 



The observations on which this paper is based have been 

 confined almost entirely to the northern half of Beaver 

 county, and that portion which lies along the Beaver River. 

 This river flows along a nearly central line through this part 

 of the county, and empties into the Ohio at Rochester. Its 

 banks are frequently precipitous and afford excellent expo- 

 sures of the strata.* 



The city of New Brighton is on the left bank of the river, 

 about three miles from its mouth, and almost directly oppo- 

 site is the town of Beaver Falls, Seven miles above New 

 Brighton, at the junction of the Pittsburg and Erie railroad 

 with the Pittsburg, Fort Wayne and Chicago railroad, we 

 find the village of Home wood. The line of section begins 

 at Homewood and follows the Beaver River to Rochester. 

 The strata here exposed extend from the Mahoning sand- 

 stone to the base of the Tionesta sandstone, and dip south- 



* Beaver county occupies a nearly ceutral position in the tier of counties which 

 form the western border of Pennsylvania. The Ohio River, flowing nearly due west 

 through the greater part of the county, divides it into two subequal portions, a north- 

 ern and a southern ; the former of these abuts against the Ohio 6tate line, the latter 

 against that of West Virginia, at the narrow end of the " Pan Handle." The Beaver 

 River flows into the Ohio in a nearly southerly course, and thus divides the northern 

 half of the county into an eastern and a western portion. 



