Maryland Geological Survey 355 



of oornstone or a calcareous layer containing pebble?. In one of these 

 strata in the lower part of the quarry are a few poorly prcsei-ved fossils. 

 The dip is 20° S., 15° E. This quarry was opened for flagstones without 

 success but it would yield dimension stone for foundations and similar 

 purposes. To the west of the quarry along the hillside the rocks are 

 mainly red argillaceous shales, but there are some greenisli shales and 

 sandstones alternating with the red rocks. 



No. 4- Outcrops in the cliff to the west of the house of George 

 Pelton composed largely of red argillaceous pencil shale with thin sand- 

 stone layers in the upper part. In this part of the zone is a slightly 

 calcareous layer in which Spirifer mcsastriah's Hall is abundant and 

 there are a few other species the most abundant one of which is Amho- 

 coelia umbonata (Conrad). Farther toward the west the sandstones are 

 more prominent, one massive stratum, near which a few fossils were 

 found, being over 6 feet thick. Tliere are also numerous pieces of 

 coarse grit varying to conglomerate. The upper part of this zone is very 

 red. In the red rocks to the east of the house no fossils were found. 

 The thickness of this zone is estimated as about 500 feet. 



No. 5. A little farther west and with continuous exposures from No. 

 4 is an excavation where shale is obtained for the highway. At the top of 

 No. 4 is a zone of yellowish shale, some of it partly mottled, in which there 

 are fossils, as for example Arnbocoelia umbonata (Conrad), Chonetes, and 

 several species of pelecypods. These shales are mostly soft and argil- 

 laceous and below them are brownish to somewhat reddish ones as 

 well as buff and some that are decidedly olive in tint. In the shales along 

 the road in ascending the slope to the west, no fossils were found. This 

 zone was estimated as 275 feet in thicloiess, the lower part of whicli is 

 composed mostly of buff shales. A little farther west are buff, argillaceous 

 shales, somewhat micaceous but non-fossiliferous. There are also layers 

 of sandstone one of which is massive, of fairly greenish-gray color, very 

 hard and about 7 feet in thickness. 



From numbers 4 and 5 of this section east of Millstone the following 

 species as determined by Dr. Clarke were collected : Amhocoelia umbonata 



