BARRIS — OUR LOCAL GEOLOGY. 25 



three or four feet. Its buff color suggests the Parryanus beds, but 

 among the few thin, broken fragments of shells we scarce recognize 

 any species from those beds. It abounds, however, in what seems to 

 be the Cystodictya hamilfonensis of Ulrich; if not, a larger form of the 

 same genus. Placing this rock, which is most probably local, at the 

 head of the series, we have this section : 



FEET. 



1. Buff limestone regularly bedded. ..... 3 



2. Upper limestones and shales, irregularly stratified on either 



side of the falls. ....... 10 



3. Crinoidal strata varying from two to six inches in thickness. 6 



4. Orthis bed including here some other forms. ... 4 



5. Crinoidal bed at base of quarry, in which most of the Crino- 



idea occur. ........ 3 



6. Lower limestone and shales extending in huge generally de- 



tached blocks to the river. ...... 



The levee in front of the village is made up of the lower members 

 of the series. Taken together they present a greater thickness of hor- 

 izontal strata than is found elsewhere. The best-preserved larger fos- 

 sils of the Spirifer Pennatus beds have been found here. 



The Sixth Ravine occurs one mile and a half below the village. 

 Stevenson's Creek flows through the bottom-land to the river, and at 

 its mouth the upper limestone appears as an extended, hard, solitary 

 mass detached from its ordinary surroundings. One mile further 

 north, directly under the Spirifer Parryanus beds, and accompanying 

 them for some distance, with a thickness of little over two feet, is the 

 coral reef. Its surface is covered with many roughened coralline forms. 

 Prominent among these are the Acervularia davidsoni and Cystiphylhim 

 americanum, as in the Fourth Ravine. With greater extent of the reef, 

 they are in greater abundance. Half a mile further north is found an 

 extension of the same strata, containing the same fossil forms, in a 

 similar position at the base of the Spirifer Parryanus beds. The fossils of 

 these beds are, for convenience of reference, arranged in three classes. 



I. — The more common forms: 



Acervularia davidsoni Hall. 



Alveolites goldfussi Billings. 



Astroeospongia hamiltonensis Meek & Worthen. 



Atrypa aspera, var. occidentalis Hall. 



Atrypa reticularis Linnaeus. 



[Proc. D. a. N. S., Vol. VII,] 4 [ September 21, 1897.] 



