An Account of the Middle Silurian Rocks of Ohio and Indiana. 



173 



grained brownish massive rock, inclined to break up into shaly frag- 

 ments. Its color was undoubtedly bluish before weathering. It is 

 difficult to determine here the line of demarkation between the Clinton 

 and the Belfast bed, since the transition, whether owing to the decay 

 of the lower Clinton or otherwise, is not sufficiently abrupt. The Bel- 

 fast bed varies therefore between five and eight feet in thickness, ac- 

 cording to where the dividing line is placed. 



The same siliceous Clinton is found west of the water tank, about 

 two-thirds of a mile west of Durbin, along the same railroad, and also, 

 half a mile southwest from the latter locality, at Snyder's Station, on 

 the south side of the river, along the railroad. The Belfast bed was 

 not found here- A blue clay capped by limestone is reported in the 

 woods, three-quarters of a mile southeast of Snyder's Station, but ap- 

 parently at a higher level. This would be a very anomalous occur- 

 rence and deserves investigation. Since not seen by the writer, no 

 opinions upon it can be expressed here. 



12. Brown's Quarry — half a mile south of Brown's Station, and 

 two and a half miles west of New Carlisle. Here only the upper eight 

 or ten feet of the Clinton are to be seen. It is almost a pure lime- 

 stone, white in color, and on weathered surfaces reveals a sort of cross- 

 bedded structure. Favosites niagarensisy with 5 tubes in 10 m m., 

 occurs here in hemispherical masses, the largest reaching a height 

 ot 17 and a width of 35 cm. Diphypliyllum ccespitosum exists here 

 in masses, reaching a height of 47 and a width of 57 cm. About ten 

 or twelve feet beneath the top of the Clinton the rock is reddish 

 and has been worked into finely polished slabs under the name of 

 marble. Beneath this are said to occur about 18 feet of a light buff 

 rock, not seen by the writer, under which is a blue shaly rock. If 

 the buff rock be included with the Clinton, the bluish shaly rock is 

 then possibly the Belfast bed. The workmen descended only one foot 

 into this layer. 



13. Morris Hill — half a mile northeast of Dodd's Station, on 

 the Dayton, Lebanon and Cincinnati railroad. The sections on the 

 north and south of Morris Hill along the road cross- 

 ing the same, do not agree exactly. Along the highest part of the 

 road about seven feet of coarsely crinoidal Clinton limestone are 

 exposed. It is weathered to a brownish color and contains few fossils. 



