396 



Scientific In telligence. 



Upper 

 Cambrian 



Taconic 



St. Peter 

 Shakopee 

 Richmond 

 Lower Magnesian 

 Jordan ) 



St. Lawrence > St. Croix Series. 

 Dresbach ) 



[ Hinckley sandstone, .passing down into 



f Potsdam Red sandstone, interbedded with 

 Manitou Lavas, and 

 Potsdam Quartzite (at New Allen ) Middle 



and the Puckwunge Conglomerate j Cambrian. 

 Cabotian (igneous) ^ 



Red Rock Apobsidian red granite 

 Gabbro and its varieties and Lavas '.Lower 

 Animikie j Cambrian. 



Slates and Quartzite 

 Taconite and Quartzite J 



f Granite, Syenite, etc. Laurentian. 



! Crystalline schists and gneiss Coutchiching. 



' Various fragmentals ) rr 

 rr ■ w • n ± r Keewatin. 



Kawishiwin Greenstone \ 



h. s. w. 



4. Iowa Geological Survey. Vol. XI. Administrative Reports. 

 Samuel Calvin, State Geologist. Pp. 1-579. Pls„ i-xii, figures 

 1-43. 9 maps. Des Moines, 190 L. — This volume carries forward 

 the detailed Survey of the State of Ohio by the present staff of 

 geologists to cover the counties of Louisa, Marion, Pottawat- 

 tamie, Cedar, Page, Clay and O'Brien. In the report on Cedar 

 County we note that Professor Norton transfers the Coggan 

 formation from the Silurian, to which it was previously referred, 

 to the Devonian system, with which it is more naturally referred 

 by its few though diagnostic fossils. h. s. w. 



5. Dragons of the Air, an account of Extinct Flying Reptiles; 

 by H. G. Seeley; pp. 1-232, and 80 illustrations. , London, 

 1901 (Methuen & Co.). — The close kinship between a fascinating 

 novel and a well-written popular book of science is illustrated by 

 Professor Seeley's story of the " Dragons of the Air." A thor- 

 ough grasp of the scientific facts in the case is united with a rare 

 power of imagination and of pictorial description, which would 

 have served the historical novelist as successfully as it has the 

 paleontologist in the present case. The sense of the marvelous is 

 used legitimately at the outset by introducing the mythical 

 dragons and angels, and finding even greater anomalies in the 

 actual wings of fish, frogs, lizards, squirrels and cats, and teeth 

 in birds and beaks in reptiles and mammals. 



The Ornithosaurs, the scientific name of these flying dragons, 

 are not described in order to magnify the oddities of nature, but 

 the author has sought to show the natural affinities of a most 



