318 Reviews — Geological Survey of the Austrian Empire. 



Nos. 4 to 1. Tyddyngwladis slates and traprocks ; 1136 feet. No. 

 4 has the large Paradoxides Davidis and Theca. No. 3 contains 

 Obolella, Oholus, Theca, Lingida, Protospongia, Agnostus rex, A. 

 princeps, A. pisiformis, A. trisectus, Microdiscus, and Anojjolenus. No. 

 2 yields at Tyddyngwladis and elsewhere, Paradoxides ForcJihammeri, 

 Anopolenus Jlenrici, Agnostus. Protospongia, Theca, Lingula, Obolus, 

 Obolella, and Leperditia. No. 1 has not been worked. Nos. 4 to 1 

 are the Lower Lingula-flags. The Lingnla-flags are regarded by 

 Mr. Salter as the Upper Cambrian beds, and the same as the 

 "Primordial zone" of M. Barrande. The Harlech Grit, or Lower 

 Cambrian, lies below the Tyddyngwladis schists. 



This improved classification of the "Lingula-flags" is due to the 

 well-directed labours of Messrs. Salter and Williamson, backed by 

 the energetic support of Mr. Eeadwin, who is warmly interested in 

 the progress of geology as well as in the furtherance and improve- 

 ment of gold-mining in Merioneth ; and it adds considerably to the 

 known structural details of that region as shown by the map-sheets 

 of the Geological Survey, good as they are. 



V. — Geological Survey of the Austrian Empire. 



[Jahrbuch der ea.is.-kon. geologischen Eeichsanstalt. 1865. Vol. xv. 

 No. 2. April— June.] 



n^HE results of earnest, conscientious, clear-sighted geological 

 I work, well managed and carefully recorded, are to be foimd in 

 the Jahrbuch of the Imperial -Eoyal Geological Institute of Austria. 

 The Transctions and the Maps published by the same scientific body, 

 and the fine Museum they have collected for the State, are good 

 evidences of their work, — of their enthusiastic labours, well directed 

 by the veteran Haidinger, and supported by the enthusiasm of good 

 Austrian geologists, rewarded with little more than the satisfaction 

 of skilfully deciphering the earth's history, explaining the structure 

 of their country, indicating its mineral resources, and adding hard- 

 won fact to fact, and generalization to generalization, for truth's 

 sake. Communications from geologists, miners, mineralogists, and 

 others not on the Survey, are also received and published by the 

 Institute. 



In the number before us, H. Wolf describes the subdivisions of 

 the Cretaceous Series in Bohemia : namely 1. (uppermost). The 

 Senonian Group, consisting of the Baculite-marl and the Calianassa- 

 sandstone. 2. The Taronian Group, — or the Scaphite-marl, and the 

 Hippurite-limestone with conglomerate. 3. The Cenomanian Group, 

 comprising the Ehotomagensis bed, and the " Lower Quader." 

 Their synonyms, characters, and fossils are carefully noticed and 

 tabulated. Dr. Ferdinand von Hochstetter gives an account of 

 the petroleum and asphalt of Western Galicia, which may possibly 

 come from Tertiary lignites, or quite as probably from deep-seated 

 coal-bearing strata, by means of the great cracks traversing that 

 region. Dr. A. Madelung treats of the eruptive rocks, called 



