KICHMONDIAN SERIES 699 



make their appearance, but on the north shore not until the upper part 

 of this zone. Other fossils are Calapoecia anticostiensis, Columnaria 

 aheolata, C. halli, Favosites ( ?) prolificus, Beatricea undulata (most 

 abundant), B. nodulosa (rare), Dinobolus, n. sp., CUtamhonites diversus, 

 Leptoena nitens, Rhynchotrema anticostiensis^ Rhynchonella (?) janea, 

 etcetera. 



Zones B7-B11. On the southwest shore of the island these beds do not 

 yield a fauna, but Beatricea are seen sparingly throughout. 



On the north shore the same zones are first seen at Steamer Bow, where 

 40 feet of thin limestones and shale are exposed^ the base being concealed. 

 Following an unexposed area in Broom Bay, there are at Point Joseph 70 

 feet of arenaceous shale with thin limestone, succeeded by a cross-bedded 

 sandstone. It is at the base of this sandstone (see page 703) that for 

 the present the writers would draw the dividing line between B and C. 

 There is here, then, 110 feet of measured beds and two intervals, each 

 more than a mile long, in which the thickness of the strata is not known. 

 It therefore follows that the thickness of 261 feet for these zones on the 

 south shore is paralleled by a similar depth on the north shore. 



Correlation. — In this division there are present many of the typical 

 middle and upper Eichmondian fossils of southwestern Ohio (those of 

 the Waynesville to Elkhorn zones) ^^ and, as well, others found to the 

 northwest of the Cincinnati axis. It is also to be noted that the very 

 diagnostic Beatricea appear in the Saint Lawrence sea above the loM^er 

 third of Division B, and in the Mississippian sea not earlier than the 

 upper Eichmondian at the base of the Liberty beds. In these conditions 

 is thought to exist safe guidance for correlating Anticosti Divisions A 

 and B as about equivalent to all of the Eichmondian of the Mississippian 

 sea. 



The fossils of zone B of Anticosti that also occur or have close allies 

 i n the Eichmondian of the Mississippian sea are the following : Beatricea 

 undulata, B. nodulosa, Calapoecia cribriformis, Columnaria halU, C. 

 alveolata, Favosites ( ?) proliflcus, Climacograptus putillus, Reteocrinus 

 fimhiiatus^ Dendrocrinus latihracliiatus , Palasterina rugosa, abundance 

 of Nematopora, ArtJKroclema, Helopora, and Sceptropora facula, Dinor- 

 tliis suhquadrata, Dalmanella nieelci, StropJiomena neglecta, S. fluctuosa, 

 Leptcena nitens or unicostata, Rhynchotrema anticostiensis, R. perlamel- 

 losa, Catazyga anticostiensis, Byssonychia subrecta, Conradella pannosa. 

 Cheirurus icarus, and Illcenus alacer {suscf group). 



The most strikins^ difference between the fauna of Anticosti Divisions 



15 Cumings : Thirty-second Annual Report of the Department of Geology, Indiana, 

 1907. 



