TKANSLATIONS AND NOTICES 



OF 



GEOLOGICAL MEMOIRS. 



On Jttkassic Deposits near Yieni^a. By Herr C. Gtriesback. 



[Proceed. Imp, Greol. Institute, Vienna, February 4, 1868.] 



The Jurassic series from theEhsetic formation up to the Neoeo- 

 mian has been found well represented in a circumscribed area near 

 St. Yeit, about 2| miles north-west of Vienna. The Koessen strata 

 are well developed and very fossiliferous ; but their stratigraphical 

 relations v^dth the remainder of the Lias could not be ascertained. 

 The Dogger is represented by the zones of Ammonites Sauzeanus, A. 

 Hicmphriesianus, and A. Parkinsoni. These deposits strike N.E. 

 and S.W., dipping IST.W., and form, as it were, an island in the un- 

 conformable Upper Jurassic deposits. 



The Klaus beds may possibly be represented by a fine red lime- 

 stone containing Crinoids, and occurring in two localities, as it yields 

 a Terebratula very similar to T. JRoveredana, Benecke. This and 

 another red limestone, the latter containing Aptychi, strike from E. 

 to W., and dip S., overlying the Dogger unconformably, but they are 

 conformably succeeded by the white Neocomian limestone, which 

 yields Aptychus Didayi, Coq. The former has afforded AptycJius 

 Icevis, A. latus, A. gihbosus, A. lamellosus, A. crassicauda, Belemnites 

 hastatus, and B. canaliculatus. 



[Count M.] 



On MiCEOscopic Plaints and Animaxs in Eruptive Eoce:s. 

 By Dr. Gitstav Jenzsch. 



[Ueber eine mikroskopische Flora und Fauna krystalUnischer Massengesteine 

 (Eruptiongesteine), von Dr. Gustay Jenzsch. Leipsig, Engelmann, 1868.] 



In" this preliminary pamphlet the author announces a remarkable 

 discovery that he has made, namely, that various " eruptive '" rocks, 

 such as the melaphyre of Zwickau and the Thiiringerwald and the 

 porphyry of Halle, contain the microscopic remains of organisms 

 imbedded in thin crystalline constituents, and not merely in the 

 calcite and other materials by which spaces in the rock have been 

 filled up. His observations were made upon cut and polished sec- 

 tions of the rocks, taken not from the surface (where weathering 

 might interfere), but usually from quarries. 



The organic forms detected by Dr. Jenzsch in these rocks are cha- 

 racteristic of standing fresh water. No Diatomacese have occurred 

 to him ; and of the Carapaced Infusoria, only a few Arcellce have been 

 met with. Of plants, he says that he has met with entire well- 



VOL. XXV. part II. -B 



