44 The Ohio Naturalist. [Vol. XIII, No. 2, 



Dekayella ulrichi and some species of Eridotrypa is present. These 

 fossils indicate the Eden age of the upper limestones in this 

 Sheguindah section. The strata belong somewhere near the upper 

 part of the Economy or the lower part of the vSouthgate section 

 apparently. The thickness of this richly fossiliferous limestone 

 and clay section may equal 20 feet, but only the lower 5 feet are 

 well exposed along the Sheguindah road. 



One hundred and twenty-seven miles southeast of Little 

 Current, along Workman's brook, two miles east of Meaford, 

 Trinudeus beUulus and Callopora sigUlarioides are exposed about 

 4 feet above lake level, and this is the reason for including the lower 

 clay shales in the same section as the upper undoubted Eden 

 limestones. In the Workman brook section, the Eden limestones 

 become common about 75 feet above lake level, and that part of 

 the Eden section which lies above this level may equal 50 feet. 

 B. Wekwemikongsing Beds; Lorraine. 



Overlying the undoubted Eden beds, there is a series of strata 

 containing Whiteavesia pholadifonnis, Modiolopsis concentrica, 

 Byssonychia radiata, Lyrodesma poststriatum, Clidophoriis planul- 

 atus, a large Ctcnodonta belonging to the pectunculoides group, 

 and a species of graptolite identified by Dr. Ruedemann as nearest 

 to Diplograptus angustifolius mut. vespertinus from the Middle 

 Lorraine of New York. In fact, the general aspect of these strata 

 is Lorraine, since the lamcllibranchs occur in siliceous limestones 

 which weather into fine grained sandstones, as is the case in the 

 typical Lorraine. 



In the lower strata belonging to the Wekwemikongsing section, 

 as exposed south of Little Current, Dr. Ulrich identified Bythopora 

 dendrina and Bythopora gracilis. From a corresponding horizon 

 at the base of the Wekwemikongsing section, immediately south 

 of the Richmond Clay Clift's, on the eastern side of Cape Smyth, 

 he identified Dckayia pelliculata in addition to the species named. 

 The most interesting list, however, was obtained along Workman's 

 brook, east of Meaford, where, in the 25 feet of strata underhdng the 

 Catazyga erratic a horizon, Dr. Ulrich identified Callopora near 

 dalei, Coeloclema sp., Dekayia appressa, Ilctcrotrypa cf. injlecta, 

 Leptotrypa ornata, and Perenopora compressa. These bryozoans 

 suggest the middle Maysville age of these strata below the Cata- 

 zyga erratica horizon. Dr. Ulrich placed them at approximately 

 the Bcllcvue horizon. The base of the Wekwemikongsing beds 

 on Workman creek appears to be about 50 feet below the Catazyga 

 erratica horizon. 



The only bryozoans identified between the Catazyga erratica 

 horizon and the base of the undoubted Richmond, with Catazyga 

 headi, Cyclonema bilix, and Strophomena planunibona, KiO feet 

 farther up, are Stigmatella cf. nicklesi, Discotrypa cf. elega)is, and 

 ^ patio pora aspera, also suggesting Maysville age. 



