Reviews — Billings^ Fossils of Anticosti. 213 



7. Chazy limestone U- Llandeilo 



8. Sillery ) 



9. Laiizon > Quebec 



10. Levis ) ... L. Llandeilo 



11. U. Calciferous 



12. L. Calciferous U. Tremadoc 



13. U. Potsdam L. Tremadoc 



14. L. Potsdam U. Lingula 



15. St. John's group L. Lingula 



Tlie whole aspect of No. 1 is very mucli like that of the U. Llan- 

 dovery, especially in certain SiropJiomena, Leptcena, Pentamerus, 

 Stricklandinia, Spirifera, Cyrtia, and Leptoccelia. The L. Llandovery 

 is like No. 2, because it contains a curious admixture of both Upper 

 and Lower Silurian types. No. 10 is connected with the L. Llandeilo 

 or Skiddaw by a great development of Graptolites. No. 10 carries 

 a fauna very distinct from Nos. 7 and 12, with which it has been 

 heretofore confounded, containing 220 species (51 graptolites). 

 No. 12 is the original Calciferous Sandstone of N.Y., and finds its 

 nearest analogue in the Durness limestone of Scotland. No. 15 is 

 identical with the Lower Lingula flags, as determined by the Parad- 

 oxides. These are considered to be quite satisfactorily paralleled; 

 the other groups upon the same lines are supposed to have been 

 nearly equivalent, because they come between others that are 

 identical. 



The Trenton limestone has been paralleled heretofore with the 

 Llandeilo, with which it has scarcely any palaeontological character 

 in common. It abounds in Cystidece and Asterida, BhyncJionello), 

 Strophomen(e, and Zoophyta of the group Zoantharia rugosa, and thus 

 is more nearly allied to the Caradoc. The Sillery and Lauzon 

 divisions are very sparingly fossiliferous. The stratigraphical 

 relations of the Levis formation are best shown in Newfoundland, 

 where the same fauna as that near Quebec appears in slightly inclined 

 strata, but above the true calciferous as well as an intermediate 

 group unlike anything elsewhere known. The Levis in Newfound- 

 land is 1400 feet thick ; the Upper Calciferous 1300, and the Lower 

 Calciferous 1800. The middle group contains the European genera 

 Acrotretra, Nileus, Holometopus, and Ampyx, which extend into the 

 following formations also. No. 13 is what has hitherto been known 

 as the Potsdam sandstone of N. Y. Can. W., Minnesota, etc. : 

 Gasteropods and Cephalopods make their first appearance here. 

 No. 14 is known only in the sandstones and limestones of Belle Isle, 

 and the " Georgia slates " and " Eed sand-rock " of the Vermont 

 Survey. They are characterised by the presence of Olenellus, 

 Baihynotus, and certain species of Bathyurus, Conocoryphe, Obolella, 

 and Camerella. The lowest group (No. 15) only contains Paradoxtdes. 

 It has been found near the Atlantic coast in Newfoundland, New 

 Brunswick, and Massachusetts. In New Brunswick it is 3000 feet 

 thick and covers other sedimentary deposits, and probably in Massa- 

 chusetts. It is certainly newer than the syenite of Massachusetts. 



It is suggested as worthy of consideration, whether a break in 

 one country may not be synonymous with a group in another ; 



