52O HISTORY OF GEOLOGY AND PAL/EONTOLOGY. 



of the North German Cretaceous Rocks^ accompanied by a 

 short geological description of the succession. In this work 

 Roemer referred the Hils conglomerates of Ostervvald, Berk- 

 lingen, and other localities, together with the Hils clay of the 

 Deister and the Hils basin, to the lowest Cretaceous horizon. 

 Their fossil contents led him to regard these German deposits 

 as the equivalents of the Neocomian strata in the Paris basin, 

 at Neuchatel, and in the south of Russia. The higher deposits 

 were thus sub-divided by Roemer : 



Upper 

 Cretaceous, 



Lower 

 Cretaceous. 



f The White Chalk, Maestricht limestone, and 

 Uppe Chalk Marls ; also the Quader 

 Sandstone of Quedlinburg and Blanken- 

 burg, the Glauconite Marls of Kieslings- 

 wald, and the Marls at Luisberg, near 

 Aix. 



( 7. Lower Chalk without flints at Liineburg, 



Lindener Berg, etc. 

 6. Lower Chalk Marls at Ahlten, Lemforde, 



etc., the sandstones with fish remains, the 



marls of llseburg, and the sponge strata 



near Goslar. 

 5. Planer Limestone of Essen, Quedlinburg, 



etc. 

 4. Greensand ot Oberau and the mottled marls 



with Avicula gryphczoides in Hanover and 



Brunswick. 



3. Gault of Goslar and Sarstedt. 

 2. Loiver Quader Sandstone of the Harz 



mountains, in Brunswick, and in the 



Hils basin ; in Teutoburg forest, Saxony, 



Bohemia, and Silesia. 

 1 1. Hils Conglomerate and Clays. 



Although Roemer's sub-division of the German develop- 

 ment is in many respects deficient, it was the first noteworthy 

 attempt at a recognition of the distinctive facies in this area 

 and a comparison with the English, French, and Swiss de- 

 velopments. 



Charpentier had in the eighteenth century contributed 

 a geological sketch-map of the surface outcrop of Quader 

 Sandstone in Saxony. Naumann and Cotta in 1835 demon- 



