70 The Middle Devonian Deposits of Maryland 



Total 

 Thick- thick- 

 ness, neas. 



The section of the Onondaga shale member at Ihis place is de- 

 scribed by Kindle, to whose account the reader is referred. 



The upper beds of the Onondaga are mainly yellowish to buff 

 very argillaceous shales as shown in the weathered outcrops. This 

 zone contains but few fossils. The overlying beds are of Marcellus 

 age 62 



Fine, argillaceous shales of a blackish to bluish-black color 

 which in the lower part weather to a slightly purplish tint. There 

 are very few fossils in the zone; but near its center a poorly 

 preserved specimen, apparently a Liorhynchus limitare (Van- 

 uxem), was found. A dip of 68° W. was measured on some of these 

 shales 98 98 



From the top of the bluish-black shales almost to the road turn- 

 ing north. The zone is composed of yellowish to buff very argilla- 

 ceous shales. There are occasional bands of rather blackish shales 

 which are quite conspicuous in the mass of lighter colored ones. . . 62 160 



Black, fissile, argillaceous shales at the side of the road turning 

 north. The dip changes at this point and, possibly, this zone is not 

 a continuation of the section 23 183 



About 60 feet is covered opposite the Mt. Hermon Church 60 243 



Fine, argillaceous shales, of bluish-gray color, which split into 

 thin pieces. These shales with a thickness of about 208 feet have 

 the lithologic appearance of the Hamilton but fossils are rare 208 451 



Covered 78 529 



Fine, yellowish-gray argillaceous shales. No fossils found 164 693 



Bluish, arenaceous shales at the base changing into thin bedded 

 to fairly massive, gray sandstones at the top of the zone. Both 

 shales and sandstones are fossiliferous. This is the loiver sand- 

 stone zone 75 768 



Yellowish to greenish-gray argillaceous shales which crumble 

 into small pieces and when weathered are greatly iron stained. 

 They contain some fossils, as for example, specimens of Spirifer, 

 Chonetes, and Orthoceras 87 855 



Covered 36 891 



Principally shales which weather to a yellowish or brownish 

 color; and, apparently, before weathering vary from a light gray 

 to a yellowish-green. There are some fossils but, as in all the 

 Hamilton zones of this section, it is not a favorable locality for 

 collecting 295 1186 



Thin bedded greenish to yellowish-gray sandstones. This zone 

 occurs near the top of the first hill southwest of Mt. Hermon Church 

 and it is near the top of the Hamilton stage. This is the upper 

 sandstone zone 30 1216 



Buff, argillaceous shales on the crest of the hill with a thick- 

 ness of about 65 feet. This zone forms the top of the Romney 

 formation which then has a thickness of 1438 feet as measured on 



