Revieivs — Mon'is's Geological Chart. 569 



OUgocene formation in the Isle of Wiglit, and the probability of the 

 Bovey beds being of Eocene age, are not lost sight of. There is, 

 however, some obscurity about the bracketted equivalent for the 

 Woolwich and Beading beds. The localities for the equivalent of the 

 Maestricht Chalk, or " Danian " formation, are not clearly printed. 

 The Neocomian including the Wealden formation is carefully indicated ; 

 but the "Horsham Stone" is set with the "Hastings Sands," instead 

 of with the " Weald Clay," as determined by the " Survey." The 

 older groups of formations are all carefully noted in their order, and 

 as clearl}^ as possible for the student in his preliminary studies. For 

 the "Lower Oolite" and the "Carboniferous," collateral groupings 

 are given for special regions. The Arch^an strata are not neglected, 

 Dr. Hicks's " Pebidian " and " Dimetian " being placed in due order, 

 and his " Arvonian" noticed in a side entry. "We wish that PalcBO- 

 pyge Eamsayi had not been left out of the Longmj'nd fossils, for it is 

 good and historical ; whilst the Oldhamian markings, that are noticed, 

 are doubtfully organic ; and a better amphibian than the questioned 

 Parahatraclius might have been entered for the " Carboniferous." 



But such weaknesses are few, after a careful examination, and 

 probably all that there are, for the author of the Table is a consum- 

 mate master of his science, and knows fossils as only a complete 

 palgeontologist can know them. His knowledge also of the range 

 of the fossiliferous and other strata throughout the land is not only 

 extensive, but minute as to details, as shown in some of the columns 

 of this Table, which gives as much information in a condensed form, 

 as to the range and economic value of strata and other rocks, as many 

 a book, pretentious in character, can yield. 



The constituents of the metamorphic and igneous rocks are noticed 

 in general terms, useful to the student ; but we fear many will be 

 somewhat puzzled by the description given of " granite " and 

 "syenite" after some German lithologists, rather than according to 

 the old-fashioned plan of English works. The igneous origin of the 

 serpentine of the Lizard is not insisted on, as we should have 

 expected it to have been. These are but few, and easily explained, 

 points of weakness ; and we have only further to remark as critics 

 that a little more care in the printer's work as to punctuation, etc. 

 (there are very few actual misprints), would have made some passages 

 rather clearer. 



The columns (or rather two halves of a long column) on the sides 

 of the Table exhibit the proportionate thickness of the several groujos 

 of formations, by the relative space given for each, with its depth in 

 figures ; and this is made the more clear and conspicuous by appi'O- 

 priate tints for several lengths, corresponding with the colours given 

 to the formations themselves in the body of the Table. 



Showing the regular formations in their succession, their principal 

 fossils, mineral characters, uses in the Arts, their British localities, 

 and relative thicknesses, this Table is admirably adapted for its 

 purpose, namely, of fixing attention upon some of the most important 

 points in geological study quickly and with the certainty of correct- 

 ness. As such, we have great pleasure and satisfaction in recom- 

 mending it to the public. J. 



