1895.] Geology and Paleontology. 273 
reef (Archzocythine) for nearly thirty miles. (Am. Journ. Sci., Feb., 
1895.) 
Prof. N. H. Winchell considers the Galena limestone only a phase 
of the Trenton, intensified in the typical locality, and fading out in all 
directions. The physical break and faunal change which follow it in 
the northeast are the probable parallels of those which mark the tran- 
sition from the Trenton to the Hudson River. (Am. Geol., Jan., 
1895.) 
A specimen of the new fossil shark, Cladodus clarkii, recently fonnd 
in the Cleveland shale of northern Ohio shows the dentition in a re- 
markable manner by reason of some fortunate fractures. The new 
specimen confirms most of the characters previously published, and 
adds a few not discoverable in former fossils. It is described and fig- 
ured by Prof. Claypole. (Am. Geol., Jan., 1895.) 
Recent examinations of the “elephant rock,” occurring in various 
parts of the Transvaal prove it to be a dolomite. Mr. Draper, to 
whom the rocks were submitted, states that this dolomite is of great ex- 
tent in the Transvaal and Namaqualand, and he is of the opinion that 
the limestone tufa, now occupying large areas in the drainage basin of 
the Vaal and Orange Rivers, are derived from the dolomite. (Quart. 
Journ, Geol. Soc., Nov., 1894.) 
