Scientific Intelligence. — Geology. 363 



crocodile. Dr Riley, who submitted the specimens hitherto dis- 

 covered to the Literary and Philosophical Society of the Bristol 

 Institution, is understood to be preparing a detailed account of 

 this interesting discovery for the Geological Society. The only 

 Saurian remain hitherto found in this island in a site approach- 

 ing to this, was a fragment of a lower jaw apparently of a gavial 

 discovered in the lower beds of the new red sandstone at Guy^s 

 CliflP, Warwickshire. This fact is noticed in Parkinson's small 

 work on Organic Remains. — London and Edin. Phil. Journ. 



4. Analysis of the Fossil Tree seen at present imbedded in 

 the Sandstone at Craigleith Quarry j hy Mr Robert Walker. — 

 Exposed to heat in a tube, it gives off bituminous matter and 

 water. Dissolves with considerable effervescence in diluted mu- 

 riatic acid, carbonaceous matter being at the same time deposit- 

 ed. Its constituents are, carbonate of lime, 50.36 ; carbonate of 

 iron, 24.65 ; carbonate of magnesia, 17.71 ; coal, with silica and 

 water 6.15; =98 87. 



5. On the Origin of the Erratic Blocks of the North of 

 Germany. — The following conclusions are given as the result of 

 Kloden's investigations on this subject ; they form the conclu- 

 ding paragraph in his interesting work, entitled, " The Petrifac- 

 tions of Brandenburg, and especially those which occur in the 

 rolled Stones and Blocks of the South Baltic Plain."" 1. A part 

 of the erratic blocks of the plain of North Germany, and indeed, 

 by much the larger portion, have a great analogy to the rocks 

 of the north of Europe, and those rolled masses which contain 

 petrifactions, also agree in their organic remains with northern 

 rocks; and indeed, there are even rocks and petrifactions among 

 them which are pecuhar to the Scandinavian peninsula. On the 

 other hand, many of the rocks and petrifactions which are cha- 

 racteristic of the north, have not been found among the rolled 

 masses, and those petrifactions which are extremely abundant 

 in Norway and Sweden, are replaced by others in the erratic 

 blocks. 2. Another part of the rocks containing petrifactions, 

 which occur as blocks, agree in external characters with the rocks 

 of the north, but contain petrifactions which have not yet been 

 found in Scandinavia. Many of these petrifactions are amongst 

 the most abundant which occur in the blocks. 3, A third class 

 belong to rocks which are entirely awanting in the north, and 



