Vol. 50.] GOSAU BEDS OF THE GOSAU DISTEICT. 139 



already known species Zekeli found that 11 occurred in the Turonian, 

 7 in the Senonian, 3 in the Turonian and Senonian together, and 

 2 in the Gault ; so he concluded that the Gosau Beds represented 

 both the Senonian and the Turonian. 



In 1854 Eeuss 1 described the foraminifera, polyzoa, entom- 

 ostraca, and corals of the Gosau Beds. He found that, of the species 

 of Gosau fossils known elsewhere, by far the greater number appear 

 in the Turonian system of d'Orbigny, and that therefore the 

 Gosau Beds represent the Turonian. The Turonian character, 

 according to Reuss, comes out especially in the calcareous and marly 

 beds, characterized by their abundance of Rudistce, corals, Nerincea, 

 and Actceonella. He thinks, however, that some of the lower beds 

 of the Senonian system may be represented at Gosau and elsewhere, 

 and formulates his conclusion thus (p. 46) : — " The Gosau Beds 

 constitute a complete and unique formation, in which marls, lime- 

 stones, calcareous sandstones, and conglomerates alternate irregularly 

 with one another, and this formation should preferably be correlated 

 with the Turonian system, and perhaps the uppermost beds with 

 the lower part of the Senonian system." Beuss's results would 

 certainly require further confirmation, since at the time when he 

 wrote there were no descriptions of the Gosau cephalopoda, brachio- 

 poda, or lamellibranchiata. Giimbel follows Beuss, and calls the 

 Gosau Beds Turonian. 2 



In 1865 and 1866 appeared Zittel's monograph on the lamelli- 

 branchs. 3 Out of 140 species here described, 88 are peculiar, 

 while the remaining 52 occur in other places. These 52 are dis- 

 tributed as follows : — 



In the Neocomian and Gault we get : — 



Modiola squalls (Sow.). — Neocomian and Quadersandstein (Bohemia) ; 

 Inoceramus Cripsi (Mant.). — Gault to Upper Chalk, very common in 

 North-western Europe, 



to which I may add Gardita tenuicosta (Sow.) — Gault, found by me, 

 I believe for the first time, in the Hofergraben. 



In the Cenomanian (Upper Greensand, Carentonian, Lower 

 Quadersandstein) we find 20 species, among which I may mention : — 



Tapes fragilis (d'Orb.). 

 Circe discus (Math.). 

 Cardium production (Sow.). 

 Protocardia hillana (Sow.). 

 Trigonia scabra (Lam.). 

 Modiola cequalis (Sow.). 



Gervillia solenoides (Defr.). 

 Inoceramus Cripsi (Mant.). 



■ latus (Mant.). 



Janira quadrwostata (Sow.) 

 Ostrea vesicularis (Lam.). 



and the majority of these are best represented in the Turonian. 

 In the Planer of North Germany, Saxony, Bohemia, and Silesia we 

 find 17 species, and 17 species also in the Quadersandstein. In the 



1 ' Beitrage zur Cbarakteristik der Kreideschicbten in den Ostalpen,' Denl- 

 schrift. d. kaiserl. Akad. Wissensch. Wien, vol. vii. p. 1. 



- ' Geognoetiscbe Beschreibung d. Bayeriscben Alpengebirges,' pt. i. p. 517. 



; Denkschrift. d. kaiserl. Akad. Wissensch. Wien, vol. xxiv. pt. ii. p. 105, & 

 vol. xxv. pt. ii. p. 77. 



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