BEEKMANTOWN SERIES 687 



line dolomite of 40 feet thickness. This is the kneaded or locally altered 

 zone mentioned above. Fossils are very scarce here, the only one seen 

 being Trochonema tricarinatum Billings. From this island was obtained 

 by Eichardson Archceoscyphia minganese (Billings). 



The Eomaine Island section may again be seen, and to better advan- 

 tage, on Mingan Island opposite the Hudson Bay Company post of this 

 region. Here the lower 35 feet appear to be the direct continuation of 

 the 40 feet of mottled dark gray dolomites of Eomaine Island, and have 

 yielded Raphistomina laurentina (Billings). 



The higher beds of Mingan Island, or Eomaine A2, having a thickness 

 of 23 feet, are more finely crystalline and better stratified dolomites in 

 beds from 12 to 32 inches thick, and have yielded Fusispira calcifera 

 (Billings) and Piloceras canadense Billings. These identical beds are 

 in all probability also exposed on Hunter and Sainte Genevieve Islands, 

 where Billings reports the occurrence of Piloceras canadense. 



On the Quebec coast, in the bay west of Clear Water Point, are seen 

 mottled and gray dolomites having a thickness between 80 and 100 feet. 

 While no fossils were seen in these deposits, their character and position 

 locate them as in part equivalent to the strata of Eomaine and Mingan 

 Islands. 



Eomaine formation, Division B. — The higher strata above the Mingan 

 Island section are beneath the southern part of the channel between Eo- 

 maine and Large Islands. The thickness of the beds in this interval is 

 estimated at between 150 and 200 feet, the lesser depth being the more 

 probable one. 



Eomaine formation. Division C. — The Eomaine strata are again 

 visible on Large Island, where the section is continued, the basal 75 feet 

 consisting of yellowish gray and dull drab colored, fine grained magne- 

 sian limestone carrying chert nodules, with a few beds of dark shale. 

 The limestone beds range up to 2 feet in thickness. Logan has erro- 

 neously referred these Large Island beds, with a thickness of 65 feet 5 

 inches, to the Chazy series (Logan, 1863, page 134). The only organic 

 remains seen here are fucoid markings and Bathyurus amplimarginatus 

 Billings ?. These beds are followed by others, of which all but the basal 

 portions are concealed, and may be seen on the reefs near the middle of 

 the west side of the island. Here the lower 15 feet have yielded BiJ- 

 lingsella (?) grandceva (Billings), SyntropJiia lateralis (Whitfield) ?, 

 Bathyurus amplimarginatus, and Leperditia n. sp. 



The SyntropJiia beds are again met with on Parroquet Island, where 

 the basal 15 feet have yielded Syntrophia lateralis ?, Euomphalus cf. 

 perfcinsi Whitfield, and an undetermined Bathyurus. This same horizon 



