1844.] 357 



section, I have not yet been quite able to satisfy myself whether 

 this limestone should, like that of the Corfu citadel, be considered to 

 lie above the laminated beds, or below them. K the latter, the case 

 is rendered easier. This limestone, like that of Fort Abraham, is 

 full of fissures, which are often filled up with ochreous matter, and 

 even in the finer fissures traces may be noticed of oxide of iron. 



The fossils are very locally distributed : at the first fossil lo- 

 cality Terebratulee only were discovered ; but at another, not 

 many hundred yards from it. Ammonites are in abundance : these 

 latter are, however, always in such a condition, from the splintery 

 character of the bed containing them, that specific identification 

 is almost impossible, although I am inclined to think that they 

 belong to Von Buch's division, Planulati, and therefore may be 

 oolitic. Portions also of Univalves occur. Returning to the Te- 

 rebratulse, some of the first specimens resembled those of the chalk ; 

 but more perfect specimens presented the character of one of Von 

 Buch's divisions, AcutcB, which as yet appears to go no further 

 upwards than the oolites. 



From a careful comparison of these fossils with the species most 

 nearly allied, ( T. pala and a species from the lower oolites of 

 Dundry), I am induced to believe that the species which I ob- 

 tained is new, and I propose to name it provisionally T. Seaton- 

 iana, in honour of the present Lord High Commissioner, who 

 has expressed himself anxious to promote a geological survey of 

 the islands. I think also the character of the species afibrds strong 

 ground for believing that the strata here belong to rocks as low in 

 the series as the oolites. 



With respect to the tertiary strata, I can at present only state 

 that in Corfu I believe that we have all the varieties (including 

 the gypsum), mentioned by Mr. Strickland as occurring at Zante ; 

 and I consider there is little doubt that the range of strata extends 

 from the newer Pliocene to Miocene, if not Eocene. In an extensive 

 excavation in the citadel, a yellow indurated calcareous sand was 

 cut into, and a beautiful, though small section exposed ; dark lami- 

 nated clays were interstratified with the sand, and associated with 

 them was a seam of lignite (5 inches thick), which along the line of 

 the excavation (450 feet in extent) exhibited numerous small faults 

 at which the clay was always curiously contorted. Under the 

 seam of coal was a more indurated portion of the calcareous sand, 

 approaching to the character of hardened marl, and in this nu- 

 merous examples of a Univalve were found, strongly resembling a 

 Buccinum from Touraine. 



2. Account of the Strata observed in the Excavation of the 

 Bletchinglet Tunnel. By Frederick Walter Slvims, 

 F.G.S., M. Ins. C.E. 



A FEW months ago I had the pleasure of presenting to the Geo- 

 logical Society some fossils collected by me in the course of the 

 construction of the Bletchingley Tunnel, upon the line of the South 



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