204 



THE GEOLOGIST. 



deposits which envelope the foot of the hill, in all respects similar to 

 the celts found at Mendon. 



The only hatchet which did not belong to the locality was a milky 

 white polished one, similar to those found at Bregy. 



M. Robert continues : 



" To strengthen my opinion that the deposits which line the valleys 

 traversed by water-courses, have been formed by those water-courses, 

 and consequently have nothing to do with the diluvium; the boulders, 

 rolled pebbles, the sand, and even the mud, have been derived from 

 the lands washed by the rivers and their feeders. 



" I applied myself, some time ago, before I studied these Celtic 

 remains from a geological point of view, to the collection of the rocks 

 and fossils to be found in the fluviatile deposits of the Paris basin. 

 Without enumerating all, I may mention having collected the 

 following : — 



1. Representatives of almost all the rocks which enter into the 

 composition of the Paris basin. 



2. Rocks of La haute Bourgoagne, principally a reddish quartz-like 

 porphyry, which is rather common, and granite rocks. 



3. JSTerinee, Terebratulas, Madrepores, &c, belonging to the secon- 

 dary formations. 



It is as well to remark that these objects have always been picked 

 up along the rivers in going towards their heads, but never above 

 the supposed situs before having been carried by the water. We have, 

 therefore, strong presumptive evidence that these same water-courses 

 have transported all the materials which enter into the composition 

 of the fluviatile deposits in which the Celtic remains have been 

 embedded. 



Fossil Fuel at Chiriqui, in Veragua, in Grenada. 



During the summer of 1859, the United States government sent 

 to Chiriqui,inthe hope to discover a favourable line for a railway across 

 the isthmus, an expedition to which Dr. Evans was attached as 

 geologist. 



He discovered in the Eocene Tertiary formation of that country an 

 extensive and thick deposit of lignite of excellent quality, and ex- 

 tremely bituminous. M. Jules Marcou has referred the fossils of this 

 deposit to the genera Carclium, Geritheum, Area, Natica, Miftilus, and 

 Nucula, which belong to the age of the " Calcaire grossiere" of Paris, 



The collective thickness of the beds of coal is nearly seventy-four 

 feet, and six are so near each other as to form a mass thirty feet in 

 thickness, capable of being worked by the same gallery. The localities 

 were it is seen are Cultivation creek, Blanco river, Sheinshik creek, 

 Pope's Island. There are numerous debris of plants in the clay. A 

 microscopic examination of the coal shows that it is formed of cellu- 

 lose plants, the structure of which may be seen both in the cinders 

 and in thin slices of the coal. 



