166 



resembling that of the Jura. The islands of Tino and Palmaria are 

 composed of this system, whence it rises into the high land of La 

 Castellana, and extends to Pignone, forming the mountains of Co- 

 regna, Santa Croce, Parodi, and Bergamo. The dolomite occupying 

 the centre of this range presents the appearance either of an included 

 bed, or of a great dyke which throws off the strata on each side. The 

 fossils of Coregna collected by the author (first noticed by Guidoni) 

 are, 



Orthoceras : — A species resembling O. elongatum of the lias, and 

 also O. Steinhaueri of the coal measures. 



Belemnites (many alveoli of). 



Ammonites : — 15 species, one of which is the A, erugatus of the 

 Yorkshire lias (Phillips's Geol. of Yorkshire); and another resembles 

 A. Bucklandi ; whilst two are fossils of the coal-measures, viz. A. Lis- 

 ten and A. biformis. The remainder are undescribed, but have been 

 drawn by Mr. J. Sowerby to illustrate this memoir. From the nature 

 of these organic remains, and principally from the presence of be- 

 lemnites, the author, whilst admitting the conflicting nature of the 

 evidence, similar to that observed in parts of the Alps described by 

 M. Elie de Beaumont, inclines to the belief that this range of lime- 

 stone, &c. is equivalent to the lias or some member of the oolitic series. 



4. Brown shale and variegated beds are seen beneath the gray 

 limestone; and again, below the variegated strata, there is a consider- 

 able developement of brown sandstone and gray schist, which consti- 

 tutes a high range extending from La Castellana to beyond Vernazza, 

 wherein a large Fucus is found. This gray schist at Monte Rosso seems 

 to have been penetrated by diallage and serpentine rocks. 



Saccharine limestone, %c. of Capo Corvo. — The coast section of 

 Capo Corvo exhibits thick and thin beds of gray limestone alternat- 

 ing with schists ; a thick-bedded fine conglomerate which passes into 

 chlorite and micaceous schists ; and saccharine limestone of various 

 colours with mica schist ; the whole in highly inclined and contorted 

 positions. Similar rocks occur between the mouth of the Magra and 

 Ameglia, where they are covered by the gray limestone, and contain 

 a subordinate conglomerate very much resembling that of the Valor- 

 sine. The author is disposed to refer this group to the same age as the 

 older conglomerates which occur between the high Alps and their cal- 

 careous zones on the side of Italy. 



Carrara Marbles. — These seem to form part of the system of gneiss 

 and mica schist of the adjoining Alpi Appuani, being distinctly stra- 

 tified and underlying the gray limestone, resembling that of Porto 

 Venere. 



Gneiss and mica schist are well exposed in the valley of the Fri- 

 gido near Massa. 



Unstratified Rocks : Diallage Rock and Serpentine. — The author ob- 

 served no traces of stratification in these rocks throughout Southern 

 Liguria, and he coincides with the views of those who consider them 

 to have had an igneous origin. In the Valley of Cravignola serpen- 

 tine and diallage rock traverse gray limestone and schist, and in one 

 part are in contact with jasper rock, which, as is noticed by M. Bron- 



