356 GEOLOGY OF EASTERN WISCON«iN. 



5. White, rather soft, granular crs'staUine dolomite, of more even tex- 

 ture than the above, and better suited for cutting. Weathers smooth. 

 In layers of 10 to 18 inches 2 ft. 11 in. 



(j. Tain, regular bedded, white, granular crystalline, rather soft, some- 

 vfhat shaly dolomite, in layers fi-om 3 to 9 inches in thiclmess, par- 

 tially concealed 3 ft. 9 in. 



7. Pure, opaque wliite, saccharoidal dolomite, of medium hardness and 



even texture, weathering comparatively smooth. In layers of 18, 



16, 17, 36, 16, and 10 inches, which occasionally unite or subdivide. 9 ft. 



8. Granular crystalline dolomite, of medium hardness, somewhat un- 



even texture, white and pale orange color, mottled and mingled. 



Layers not always well defined 6 ft. 6 in. 



Total 48 ft. 2 in. 



At Oato Falls, on the Manitowoc river, thinner and more homogeneous beds, belong- 

 ing to a higher horizon, appear in undulating stratification. At Clark's mills, two 

 miles below, similar thin beds, in broken ledges, form a wall along the bank of the river, 

 rising from 10 to 15 feet in hight, and are characterized by abundance of corals of the 

 genus FcuoaiteK. Near the old miU, a short distance below Clark's mills, on the left 

 hand side of the river, occm-s a slight outcrop, the top of which is very cherty, and con- 

 tams silicified fossils, the most conspicuous of which is the remarkable CyathophyUoid 

 coral, Amplexus fenestratus, n. sp., which attains a foot or more in length, and two or three 

 inches in diameter. A short distance down the river, from 20 to 2.5 feet of impure, brec- 

 ciated Hraestone is overlaid by about 12 feet of cherty rock containing the above men- 

 tioned coral, the whole, from its hardness, giving rise to ,the rapids. It is worthy of 

 note that these two localities are the only ones at which the above fossil has been found. 

 South of the iVlanitowoc river, the formation is overlaid for a considerable distance with 

 the glacial accumulations of the Kettle Range, and eft'ectually concealed from observation. 



In Sees. 2 and 11 of the town of Ashford, Pond du Lac county, the railroad exca- 

 vations again bring the formation to our notice. In the former section, the rock is a 

 soft, yellowish dolomite of irregular texture and bedding, and is specially interesting. for 

 the variety, abundance and pecuUarity of its fauna, as will be seen by '•eference to tlio 

 table. The cut in Sec. 11 presents a rock whose hthological characters are not essen- 

 tially different from the iDreceding, but wtich contains a very groat abundance of Fenta- 

 merus dblongus, in great variety of size and form, and an ahnost entire absence of the 

 fossils which characterize the preceding location. At the village of Elmore, m the samo 

 township, a quarry exhibits a heavy bedded rock of much more finii and homogeneous 

 texture, the sole, but abundant, fossil of which is Pentainenis ohlonr/us, in unusually largo 

 and fine specimens. 



In the N. W. 14^ of Sec. 6, in the town of Kewaskiim, at Kuhn's quany, is a porus, 

 granular, crystaUine dolomite, containing an abundance of Favositoid corals and Penla- 

 vii-nia obloriffuf:, and probably represents the horizon of the Lower Coral beds. South- 

 ward from this point, the formation is lost under the Kettle Range, and we do not again 

 MO it, or what may be supposed to be its equivalent, until we reach the vicinity of Pe- 

 Avaukee. On the Sheboygan river, at the village of Rockville, there is a slight expos- 

 ure of the upper portion of the Upper Coral beds, presenting a more than usually dark 

 gi-ay color, \vith more or less of chert, and containing but very few fossils. The drift 

 m the vicinity, however, is prolific in those species which are so abundantly present far- 

 ther to the north. 



