No. 3.] SPENCER — PAL.^OZOIC GEOLOGY. 145 



the south-western p;n-t of th;it State tlie deposits under consider- 

 ation rest either on rocks of the Cincinnati group, or on the 

 thin development of Medina shales (wliicli are from ten to twenty 

 feet thick). The conglomerates show that the underlying form- 

 ations of the Cambro-Siluriau Age had been hardened and up- 

 lifted into cliifs and shore lines before the comniencement and 

 deposition of the sediments in the seas of the Clinton epoch. At 

 this time the Can.idian Sea was one of shallow waiter. At Dun- 

 das, Hamilton and elsewhere, various thin hard beds from the 

 biise to the summit of the formation have their surfaces covered 

 vrith ripple marks. As the muddy sediments, which filled up- 

 the northern and noith-eastern portion of the Medina Sea, were 

 })rincipally derived from the debris of the Utica and Hudson 

 Kiver uroups of the Canadian highlands, so also the (>linton 

 shales appear to have been derived irom the same source; but 

 these muds iriadu.illv u-avi". pl.iee to the or<2anic limestone in the 

 western portion of the Clinton seas. 



Organic Remdins in tlir Clinton Forntntion. — Recently an 

 interesting group of small fossils was discovered by George J. 

 Hiude, Esq., F.G.S.. in Glen Spencer, Dundas. These organ- 

 isms appear as black sliiniug chitinous objects on the surface of 

 the stone, usuiilly about the twelfth of an inch in length or less, 

 and w^ere recognized by Mr. Hinde as the jaws of aujielids or 

 worms. They will be Ibund described and fii^ured in the August 

 number of the ••Quarterly Journal of the Geological Society of 

 J^ondon," for 1879. Kxeepting the jaws, no portions of the heads 

 of the animals were found. The following is a catalogue of Mr. 

 Hinde's species: 



FROM THE CLINTON BEDS. 



Eunicites clinto7iensis. 

 Eunicites coronatus. 

 Eunicites chiromorphus. 

 (Enonites amplus. 

 (Enonites frayilis. 

 AraheUitea elegans. 

 Lumhriconereites basil is. 

 Lumbriconereites triangularis. 

 Lumbriconereites armatus. 

 Glycerites calceolus. 



Besides these, he describes three species from the Niagara 

 formation ; and as I have not the specimens in my collection, 

 I will include them here with the Clinton species : 



(Enonites ? infrequens. 



Arabellites similis. 



Sta urocephalites niagarensis. 



Vol. X. K No. 3- 



