Geological Society. 321 



GEOLOGICAL SOCIETY. 



[Continued from p. 243.] 



June 22, 1864.— W. J. Hamilton, Esq., President, 



in the Chair. 



1 . " On the Fossiliferous Rocks of Forfarshire and their contents." 

 By James Powrie, Esq., F.G.S. 



Referring to his former paper for a detailed description of the 

 lower members of the Forfarshire Old Red Sandstone, the author 

 now gave a general sketch of the relations of the several beds, 

 and then descriptions of the species of Crustacea and Fish oc- 

 curring in them. The latter belong to five genera, two of which 

 (Ischnaccmthus and Euthacanthus) are new. After discussing the 

 nature of Parka decipiens, and shortly noticing the genera of Crus- 

 tacea that occur in the same rocks, Mr. Powrie concluded his paper 

 with a short synopsis of the distribution of the members of the Old 

 Red Sandstone in Forfarshire, and a discussion respecting the sub- 

 division of that formation, in which he stated that Pterygotus, Parka 

 decipiens, and Cephalaspis are always associated in the same beds, 

 and extend through all the fossiliferous rocks of Forfarshire, instead 

 of the latter characterizing a higher horizon than the others. 



2. " On the Reptiliferous Rocks and Foot-print Strata of the 

 North-east of Scotland." By Prof. R. Harkness, F.R.SS. L. & E., 

 F.G.S. 



The author showed that the foot-print sandstones of Ross- shire 

 constitute the upper portion of the Old Red Sandstone formation, 

 and that the strata embraced in a line of section from the Nigg to 

 ('ambus Shandwick, from above the Gneiss to the foot-print sand- 

 stones of Tarbet Ness inclusive, are conformable throughout, and 

 are referable to each of the three divisions of the Old Red Sand- 

 stone, — namely, the conglomerates and yellow sandstones (of a thick- 

 ness of 1500 feet) belonging to the Lower Old Red Sandstone; the 

 grey flaggy sandstones and shales of Geanies — the equivalent of 

 the Caithness flags — containing Osteolepis, Coccosteus, and Acan- 

 thodes, and thus referable to the Middle Old Red ; thirdly, conform- 

 able strata, consisting of conglomerates and foot-bearing and other 

 sandstones appertaining to the higher members of the system. 

 The foot-bearing sandstones have a thickness of 400 feet, and re- 

 present the reptiliferous sandstones of the Elgin area, though not 

 overlain by Cornstones as in that district. 



The author, in conclusion, remarked that though Stagonolepis is 

 decidedly Teleosaurian in its affinities, it does not consequently 

 mark a Mesozoic group of rocks ; for Mastodontosaurice, which 

 abound in the Trias, occur in the Coal-measures ; and stratigraphical 

 evidence shows us that Teleosaurian crocodiles have a wider geo- 

 logical range, since they are met with in the Old Red Sandstone. 



3. " On some Bone- and Cave-deposits of the Reindeer-period in 

 the South of France." By John Evans, Esq., F.R.S., F.G.S. 



The deposits to which the author particularly called attention in 



