Geology and Natural History. 71 



4. The Eparchman Interval — a Criticism of the use of the 

 term Algonkian ; by x\xdtiew C. Lawsox. Bulletin Dept. Geo!., 

 Vniv. of Calif., vol. iii, Xo. 3, pp. 51-62. — In common with many 

 geologists Professor Lawson believes that the term Algonkian 

 has been used without sufficient regard for the accepted rules of 

 nomenclature, and in such a way as to minimize the great interval 

 of erosion between the Archaean and the Animikie series of Lake 

 Superior. The time sequence of the important rock groups of 

 the Lake Superior province is believed to be as follows : 



f Cambrian (Upper diYision or Potsdam only) 



I Unconformity. 



rAL,hiJZ<jiL I i' Keweenawan, 



I Algoxkiax - Unconformity. 



'- ( Animikie =Penokee = Upper Marquette. 



EPAECH.EAX IXTERVAL. 



r HuRO>rLAN= Upper Keewatin = Lower Marquette, etc. 



I Unconformity. 



I Laurextian, so called, granite gneisses, etc., (intrusive 

 . pp-TT T7 AY J ^^ ^^^ Ontarian) and the Carltonian anorthosites. 



i f Keewatin= Lower Huronian= Crystalline 



1 Q J schists of south shore invaded by 



-^ ^ i-^- } Unconformity. [granite-gneisses 



*- I Coutchiching. 



5. Former Extent of the Ifewaric System ; by W. H. Hobbs. 

 Bull. Geol. Soc, vol. xiii, pp. 139-148, 5 tigs. — The prevalent 

 opinion of geologists in regard to the Newark beds of the Atlantic 

 border is that they were deposited in " local basins," and never 

 extended far beyond their present boundaries. Professor Hobbs 

 argues that the marginal faults favor the "broad terraue " 

 hypothesis and that the distribution of the coarse conglomerates 

 is not opposed to this theory. For a number of other reasons 

 Professor Hobbs joins Russell in the belief that the Newark areas 

 of the entire eastern border of the United States are remnants of 

 one widespread formation. 



6. Quaternary History of Southern California ; by Oscar H. 

 Heeshey. Dept. Geol, Univ. California, vol. iii, No. I, pp. 1-30. 

 1 pi. — In his studies of the California Quaternary, Mr. Hershey 

 has examined the evidence of earlier writers and has added much 

 that is new in regard to the sedimentation and crustal move- 

 ments during the Quaternarv. A time scale divided into seven 

 epochs has been constructed and the character of the erosion and 

 deposition of each epoch is given. 



7. Plissementset Dislocations deV'ecorceterrestre en Grece ; by 

 Ph. Negris. Pp. 210 ; 2 maps. (Athens : C. Beck ; Paris : C. 

 Beranger.) — Earth movements, principally foldings on a large 

 scale, have affected Greece and parts of Turkey since Jurassic 

 times; the first movement (the Olympic) was pre-Cretaceous, then 

 followed movements during the Cretaceous and the Eocene. The 

 last folding (the Tenarus), which runs from N. to S., began late 

 in the Pliocene and affected all of Greece. The Tenarus folds 

 are considered Dart of the world-wide crustal movements of late 



