202 
[Assembly 
included in the Caradoc formation, according to Murchison's arrange- 
ment, but they should evidently be classed in four distinct formations. 
Wenlock shale. 
This is identical with the shales at Rochester, which abound in the 
Asaphus limulurus of Green, (A. longicadautus, Murch.) The fossil 
common to both sides the Atlantic are as follows : 
Trilohites. 
Bumastus barriensis, found by Mr. Hall, Asaphus limulurus. 
Shells. 
Strophomena transversahs, ( Leptasna, Sow.) Orthis elegantula, (O. 
canalis. Sow.) O. hybrida, O. sinuatus, (Sow.) Orthoceras annulatum. 
Wenlock limestone. 
Mr. Murchison supposes the Wenlock limestone immediately suc- 
ceeds to the shale as it doubtless does in Wales, but the two formations 
are here separated by the following rocks ; each of considerable thick- 
ness, and with distinct fossil groups : 1 . Lockport limestone ; 2 Gyp- 
seous shales ; 3. Water lime series. Over the latter we find a blue 
sub-crystalline limestone, and then a gray shaly limestone, which to- 
gether appear to represent the Wenlock formation, both in fossils and 
mineral character. The comparative list is as follows : 
Trilohite. 
* Calymene bufo, Green, (C. macropthalma, Murch.) 
Shells. 
Strophomena euglypha, (Leptaena, Sow.) S. rugosa, (Leptaena de* 
pressa, Sow.) Atrypa prisca, (A. affini, Sow.) A. lacunosaj (Terebra- 
tula, Sow.) Pentamerus galeatus, (Atrypa, Dal.) Atrypa bidentata, 
(Terebratula, Sow.) Conularia quadrisulcata, t Tentaculites ornatus. 
Corals. 
Aulopora serpens, Millepora repens, Favosites gothlandica, F. fibro- 
sa. The Cyathophyllum dianthus, C. turbinatum, Syringipora bifurca- 
' ta ? are found only in the limestones above the shaly limestone, and se- 
* This occurs more abundantly in the Ludlow equivalents. 
t This shell is found only in the water lime series under the Pentamerus galeatus. 
