80 The Middle Devonian Deposits of Maryland 



Woodmont member of the Jennings. There is no doubt but that they are 

 above the Eomney and in the basal portion of the Jennings formation. 



Exposure at Tonoloway. — A much better section of the Eomney is shown 

 in the cuts of the Western Maryland Eailroad at Tonoloway Station. The 

 lower part of this section is referred to the Onondaga by Kindle who 

 describes it more fully on a preceding page. 



Total 

 Thick- thiok- 

 ness. ness. 

 No. 1. The contact of the Oriskany sandstone and Romney is 



nearly in the rear of the Loclil^eeper's house, but the shales for 

 some little distance above the sandstone are covered. The layers 

 of the lowest shales exposed are fairly thick, some of them varying 

 from 1 to 2^2 inches. Some of them are drab in color and they 

 contain the most fossils found in this zone. The number of 

 species and specimens, however, is small. The lower shales are 

 succeeded by those that are thinner, varying from bluish-black 

 to black which in lithologic appearance resemble much more 

 closely the usual Marcellus shale. Fossils are very rare but speci- 

 mens of Styliolina flsstirella (Hall) were found and a broken 

 specimen, apparently, of Liorhynchus limitare (Vanuxem). The 

 dip varies from 45° to 70° or more, but now and then the thin 

 shales are greatly contorted and crushed so that it is dilBcult to 

 measure the thickness accurately. In general, the exposure ap- 

 pears to agree better with the Onondaga and Marcellus than the 

 Hamilton and it is thought that they represent those members of 

 the Romney formation 328 328 



No. 2. Succeeding these thin shales are bluish, somewhat 

 irregular sandy shales which extend to Possum Hollow Run and 

 are similar to the Hamilton beds containing Hamilton fossils and 

 clearly belonging in that member of the Romney formation. The 

 greater part of this zone is covered 479 807 



No. 3. To the west of Possum Hollow Run are bluish Hamilton 

 shales and some thin bedded sandstones. The rocks from the 

 base of this zone to the western end of the section are excellently 

 shown along the bank of the canal where they form a high 

 steeply-dipping cliff. The dip, in general, is about 70° for the 

 remaining part of the section 225 1032 



No. 4. Lower sandstone zone, composed mainly of bluish, not 

 very thick bedded sandstones, which is conspicuous on the bank 

 of the canal 57 1089 



No. 5. Following No. 4 are bluish-gray, arenaceous shales with 

 an occasional thin sandstone stratum. These shales split into 

 rather irregular pieces and in lithologic appearance closely re- 

 semble the Hamilton arenaceous shales of New York. They are 



