10 GEOLOGICAL MEMOIES. 



strata of Castel' Gomberto, Laverda, and Sangonini may safely be 

 ranked in the group now generally named " Oligocene/' although, 

 with regard to the geological constitution of the Alpine region, the 

 denomination of " Upper Eocene" may be preferred. The fauna of 

 Gomberto offers the most striking analogies with the fauna of the 

 blue marls of Gaas and Lesbarritz ; it contains an abundance of large 

 species of Strombus, Cassis, and Natica ; Cerithia and Trochidce are, 

 however, predominant. The fauna of Laverda, especially of the 

 marls, includes some few species of Sinupalliate Bivalves, and is com- 

 pletely concordant with those of Oberburg (Styria) and Polschiza 

 (Carniolia). 



The basaltic tuffs of Sangonini, near Lugo, abound in Canaliferous 

 Gasteropods, especially of the genera Fusus, Pleurotoma, Murex, and 

 Tritonium : their fauna is strikingly analogous to the Eocene fauna 

 of England ; 20 species of it are common to the Inferior Oligocene 

 fauna of N. Germany (Latdorf, TJnseburg, Wolonirsleben, Helmstadt, 

 &c.). The molluscan Upper-Eocene fauna of the Yicentine shows 

 a remarkably tropical type, especially in the Gomberto strata, in this 

 respect contrasting with the equivalent deposits of North Germany. 



[Count M.] 



On the Jtjeassic and Ceetaceotjs Deposits of the Centeal Apeniones. 



By Dr. C. A. Zittel. 



[Proceed. Imp. G-eol. Inst. December 15, 1868.] 



The Tithonian and Lias group are particularly well developed. The 

 Roman Apennines show important Inferior Cretaceous beds, but only 

 scanty traces of Jurassics ("Dogger"). The succession of horizons 

 is as follows in ascending order : — 



1. Inferior Lias. Large masses of white limestones, with no or- 

 ganic remains except, in some few localities, imperfectly preserved 

 Brachiopods, Gasteropods, and Avicula j anus, Menegh. 



2. Middle Lias. Light- coloured stratified limestones, with a great 

 variety of organic remains (most of them new species), such as Am- 

 monites Davoei, u4.. JRagazonii, A.Algovianus, A. Lavinianus, abundant 

 Brachiopods, stems of Crinoids, &c. 



3. Upper Lias, with abundance oi Ammonites hifrons, A. Comensis, 

 A. serpentinus, A. radians, &c., Phylloceras heteropTiyllum, P. Nilssoni, 

 Terehratula Erhaensis, and T. Rozzoana. 



4. Inferior Dogger. Yellowish marly limestones, with Ammonites 

 fallax, A. scissus, A. MurcMsonce, and Phylloceras ultramontanum. 



5. Aptychian Shales, with Aptychus punctatus and A. latus. 



6. Tithonian horizon. Light- coloured marble-hke limestones, with 

 abundant Cephalopods, generally identical in species with those of 

 Eogoznik in Galicia and of South Tyrol. 



7. Neocomian tvhite limestones, with Ammonites incertus, Phyllo- 

 ceras infundibulum, (fee. 



8. Bose-coloured limestones, with Eucoidal shales in their lower- 

 most horizon. 



9. Scaglia, as in S. Tyrol. [Count M.] 



