lOa GEOLOGY. 



Tardy, A. Sur les cavites naturelles des terrains jurassiques, en par- 

 tioulier dans I'Ain. [Natural cavities in Jurassic rocks, especially 

 in the Ain.] Bull. Soc. Oeol. France, 3 ser. t. iii. pp. 491-495. 



. Description of swallow-holes, caves, and crevasses in the Jurassic 



limestones in this district. 



• Thenius, — . [Peat-bogs of Austria and adjoining countries.] 

 Vienna. 

 Timhal-Lagrave, E., and Dr. Jeanhemat. Exploration scientifique 

 des environs do Montolieu (Aude). [Scientific exploration of the 

 neighbourhood of Montolieu.] Toulouse. 



Tombeck, — . Note sur les etages Oxfordien et Callovien de la 

 Haute-Marne. [Oxfordian and Callovian of the Haute-Mame.] 

 Bull. Soc. Geol. France, 3 ser. t. iii. pp. 22-26. 

 • Concludes that the following are the recognizable divisions of these 

 two series in that Department : — A. Oxfordian: 1. Clay with pyritous 

 Ammonites {A. cordatus, A. plicatilis, A. Babeanus, A. crenatus, &c.) ; 

 2. Marls with. Am. j)erarmatus. B. Callovian: 3. Marly fissile lime- 

 stones with A. Lamberti and A. athleta ; 4. Marly limestones with 

 A. Jason ; 5. Perruginous marls with A. coronatus and A. anceps ; 

 6. Ferruginous marls with A. inacrocephalus. G. A. L. 



. Note sur la presence du Gault a Montierender (Haute- 



Marne). [Gault at Montierender.] Bull. Soc. Geol. France, 3 ser. 

 t. iii. pp. 49, 50 ; 1 fig. in text. 



Announces the discovery of a patch of Upper Gault in this locality, 

 containing a fauna similar to that of Folkestone and Wissant. 



. Note sur les puits naturels du terrain portlandien de la 



Haute-Marne. [The Natural Wells of the Portlandian, Haute- 

 Marne.] Bull. Soc. Geol. France, 3 ser. t. iii. pp. 168-174; 1 fig. 

 in text. 

 Describes some swallow-holes in Portlandian limestone, which the 

 writer believes to be due to epigenesis of overlying deposits of sulphide 

 of iron now turned to hydrated peroxide, thus liberating a sufficient 

 amount of sulphuric acid to act upon the limestone and erode the so- 

 called natural wells or pot-holes. G. A. L. 



Tb'rnebohm, A. E. Geognostisk Beskrifning ofver Persbergets 

 grufvefalt. [Geological description of the iron-ore district of 

 Persberg.] Geological Survey of Sweden. Pp. 21 ; 13 figures in 

 text. 4to, Stockholm. 

 Describes the nature and mode of occurrence of the iron-ores in one 

 of the most interesting mining districts of Sweden. The ores occur in 

 large lenticiolar masses, with the same dip and strike as the surrounding 

 stratified primitive rocks (eurite). Dislocations have crumpled and 

 squeezed the rock-series very much. The author speaks of the pro- 

 bability of great stores of ore lying undiscovered. A coloured geo- 

 logical map, on the scale of 1 : 20,000, showing also the distribution of 

 the mines, is annexed. E. E. 



