776 JESSE E. HYDE 



might well be considered the last stage of the Byer, but the lowest 

 occurrence of the coarse beds has been adopted as the base of the 

 member, even though this may not be the same particular streak 

 that has been observed at the supposed base in a closely adjacent 

 section. The coarse beds become more numerous and thicker in 

 passing upward and usually make up the greater part of the upper 

 half of the member. The topmost 3-5 feet of the member are 

 almost invariably made up of these coarse sands to the almost 

 complete or complete exclusion of the fine-grained material. • At 

 all points these coarse deposits carry unusually large amounts 

 of iron, their cement being largely limonitic. This feature 

 alone is often sufficient to identify the horizon. In southern 

 Ohio, beyond the fact that the topmost bed is always the 

 thickest, it is not possible to recognize the beds from section to 

 section. 



In Fairfield and Licking counties the material is noticeably 

 finer. Whereas to the southward the beds may be described as 

 made up of small pebbles, from Hocking County northward the 

 component material can only be called coarse sand. The assort- 

 ment is good and there is no notable admixture of the coarser 

 material except in certain limited beds. 



In eastern Fairfield County and central and eastern Licking 

 County a characteristic feature of the member is the remarkable 

 persistency of its beds. In its thickness of 15-25 feet, four dis- 

 tinct submembers can be recognized, all more or less persistent and 

 with more or less distinct faunules. This condition is not found to 

 the southward. Following is the section of the Allensville member 

 as exposed in the Vogelmeir quarry at Newark; beds i, 2, 4, and 5 

 can be recognized with considerable variation from Rushville to 

 Newark, beyond which they have not been followed. Both 

 Nos. 4 and 5 are likely to have lenses of coarse sand developed in 

 them extensively and No. 5 at Rushville is largely of such coarse 

 material. 



Ft. In 



5. Moderately fine-grained, irregularly bedded, yellow sandstones 

 with numerous beds of coarse, reddish, iron-stained sandstone, 

 the last mostly in the upper half, fossiliferous 14 



4. Bluish-gray, argillaceous shale, little grit, fossiliferous 3 9 



