Reviews — Geology of Prussian-Silesia. 327 



The Jurassic deposits of Upper Silesia and Poland bIlow the greatest affinity to 

 the Jura of South Germany, especially that of Wiirtemberg, not only as regards their 

 fauna, but also in the lithological features of the formation, which renders it most 

 probable that the Jurassic seas were in direct communication. But this communication 

 could only have existed as a narrow strait in the Kai-pathians, through Moravia, in 

 the direction of Vienna, to Regensburg. 



A peculiar feature of the Silesian Jurassic formation is the entire absence of 

 Liassic beds; Jurassic beds resting conformably on the Upper Keuper formation.^ A 

 comparison with the Jurassic deposits in North-western Germany shows the entirely 

 different character of the Silesian Jura ; whilst all the Jurassic deposits which are 

 known in Western Prussia, and also in Pomerania, show that the sea in which they 

 were formed must have been in dii-ect communication with the eastern seas of Poland, 

 Eussia, and Silesia. 



C. Cretaceous Formation. — This is found to occur in three groups of strata, which 

 in no way agree in their character with each other. 



Group A^ forms a part of the Beskides, between Teschen, Skotschau, Bielitz, Kentz, 

 and "Wadowice. 



Group B, is seen near Oppeln and Leobschiitz. 



Group C, on the eastern slopes of the Jurassic hills between Krakau and Czenstochau. 



A. {JVeocomien.) The Beskides, which belong to the Karpathians, are nothing else 

 but a continuation of the Alps. 



1. Lower Teschen shales (Lower Neocomien after Hohenegger). Grey marly 



shales, thickness 1200 feet. Aptychiis, Belemnites, etc. 



2. Teschen Limestone (Middle Neocomien of Hohenegger). A dark grey limestone, 



thickness 300 feet. 



a. Lower group, thinly stratified limestone with shaly layers between, which 



contain a few Fucoides and other fossils. 



b. Upper group in thick banks of sandy dark limestone. 



3. Upper Teschen Shales and Grodischt Sandstone, black bituminous shining 



marly shales, with Sphserosiderite. (Upper Neocomien of Hohenegger.) 



4. "Wernsdorf beds (Etaare Urgonien, partly Aptien of Hohenegger). Thickness 



400-500 feet. Black marls and shales with Sphserosiderite. This series 

 forms a zone along the northern slopes of the Karpathians. Scaphites Tranii 

 (Puzos), Crioceras Fuzosianus (d'Orb.), Belemnites dilatatus, Apiyehus Bidayi, 

 (Coq.), etc., etc. 

 Eoemer differs from Hohenegger, as he does not hold the Aptien is sufficiently 

 proved by one Ammonite and an Ancyloceras, but considers the Wernsdorf beds to be 

 Urgonien. The Neocomien strata, on the northern slopes of the Karpathians, show 

 the same character as those of the Alps, but differ greatly from those of North- 

 western Germany. 



5. Gault. — Hohenegger considers the mighty deposits of Sandstones of the 

 Karpathians and Beskides (up to 4000 feet) as Gault, and calls them Godula Sand- 

 stones. The lower portions are generally sandy slates and shales, whilst the upper 

 ones consist mostly of Sandstones, Conglomerates, etc. Although poor in organic re- 

 mains, these deposits are correctly referred to the Gault, by their position lying con- 

 formably between the Wernsdorf beds (Urgonien) and the Istebna Sandstone 

 (Cenomanien). 



6. Upper Cretaceous Series. — Baculites marl of Friedeck and Baschka beds ; the 

 first a bluish grey sandy lime marl with B. Faujasii, the latter vast beds of fine- 

 grained sandstone containing lime with marls and hornstones. But few fossils, 

 Inoceramus, Aptychus. 



B. Cretaceous rocks of Oppeln and Leobschiitz. forming a few islands in the Diluvium. 

 «. Oppeln. 



aa. Beds, belonging to Cenomanien, underlying the Turonien of Oppeln. 



1 . At the bottom, compact white sandstone. 



2. Glauconitic grey or greenish sand. 



3. At the top, fine-grained white sandstone. 



Ammonites Ehotomagensis, Turrilites costatus, etc., etc. (page 290, et seq.) 

 bb. Marl, belonging to the Turonien. Thickness, 70 to 100 feet ; white and light 

 grey lime marls, near the base siliceous, and containing many hornstones ; near the 

 top, argillaceous. This deposit is very like the Planer of Saxony, Bohemia, etc., etc. 



