TRANSLATIONS AND NOTICES 



GEOLOGICAL BOOKS AND MEMOIRS, 



Sulla Coslituzione Geologica dei Monti PisanL Memoria del Prof, 

 Cav. Paolo Savi. Pisa, Presso rocco Vannucchi, 184^*. 



The author of this work, well-known for the interesting observations 

 which he has published on the geology of Tuscany, having recently 

 had an opportunity of completing his examination of the secondary 

 formations in the neighbourhood of Pisa, has now published the 

 principal results of his inquiries, in the hope that they may assist in 

 clearing up some of the points which have hitherto been subjects 

 of controversy amongst Italian geologists. It is proposed in the fol- 

 lowing pages to give an analysis of his observations, and of the results 

 at which he has arrived. 



After a brief account of the physical features oF the district, the 

 highest point of which, called Croce ai Termini, is 1569 braccie 

 (2824 feet) above the level of the sea, the author describes the 

 rocks of which it consists, commencing with the most recent, in 

 descending order. The tertiary formations are entirely wanting in 

 the Pisan mountains. The secondary rocks contain, as is well known, 

 but few fossil remains or vegetable impressions ; so that it is 

 difficult to apply to them the same subdivisions which characterize 

 those of the North of Europe ; the various strata are, therefore, 

 distinguished by our author by names bearing reference either to 

 the nature of the predominant rocks, or to the fossils contained in 

 them. 



Thus the secondary formations of Tuscany are divided into the 

 following principal groups, in descending order : — 



1. Macigno; marly argillaceous schists with subordinate lime« 

 stones. 



2. Dark grey limestone with flint, and fucoid marly limestone. 



* On the Geological Structure of the Monti Pisani. By Prof. Paolo Savi, 

 Pisa, 1846. 



VOL. rii. PART II. B 



