Free Remarks on IJr. GreenouglCs Geological Map, 381 



ever of attempting to follow this course, Mr. G, has, on his Map, 

 navibd each of the 34 Group'; of Strata that are separately de- 

 picted thereon by colours, after some Place or District : these 

 Places or Districts, being those (as ha says) " where each Group 

 maybe best stiidiedf." 



• And thirdly, and chiefly I feel happy, because now, further, 

 delusive and exaggerated pioniises, of the high denree of excel- 

 lency to which this Map was to attain, made by Mr. G. his Con- 

 tributors, and G. S. Friends, must be at an end ; it is now he- 

 fure the Public, and many besides myself will carefully compare 

 it with Mr. Smith's 15 Sheet, and his one Sheet Maps, and more 

 especially so, with the 12 of his Cojtr/ty Geological Maps, which 

 are on Sale, separately : and I hope and trust, for the character 

 of the Country and Age in which I live, as well as for tlie sake of 

 my much-injured Friend Mr. Smith, that the result will !)e, such 

 a future sale and spread of his Maps and Vv'orks, as shall at least 

 rc-instate the Fortune, of this ingenicus and deserving Individual, 

 As to Sections, properly so called, exhibiting a supposed ver- 

 tical division of the Earth, along some particular Line (a Koad 

 for instance, which is defined, and shown on the Map), fof 

 showing the edges of the Groups of Strata, and the manner and 

 form of their overlieing each other, no such thing will be found, 

 either in Mr. Greenough's Memoir, or on his Map; which is the 

 more surprising, because Mr. Wm. Phillips, who has been sup- 

 posed to be well versed in the G. S. secrets, in p. 29 of the Ap- 

 pendix to his " Outlines," 1st Edit,, gave reasons to expect, 

 that the " great Map" of the " Geological Society," would when 

 published, be accompanied by numerous Sections, and by an 



f I believe myself to have been the Writer who, in Jane 1814, first re- 

 comraendej this principle, o( naming Assemh\ag;es (or Groups) of Strata, in 

 pajre X. of the Pref;ice to my Derhyshire Report, Vol. I. Mr. Smith, I be- 

 lieve, in a partial manner adopted the same principle, in the earliest stages 

 of his invcstig.itions, although in the first account of the " Order of the 

 Strata", which he privately circulated in 1799, (two years before I had 

 heard or read of Mr. S. which first occurred in the spring of 18U1,) and 

 ■which account he published in September 1815, in ji. 8 of the Memoir ac- 

 companying his Map, not one of liis 2'A Strata were so named : — wliile he 

 was giving mc Instructions, in the Autumn of 11*^01 and Spring of 1S02, 

 Mr. S. usually spoke of, and desciibed a large portion of his mapped Strata, 

 by tiie Nufiics of Places upon tiiem, and 1 have accordingly, in niy first short 

 account of his Order of tlie Strata, (p. 11 1 to 1 14 of Deri) Rep.'V. I.) thus 

 named 10 of his Strata: yet before the publication of his Map, Mr. S. ap-- 

 pears to have so far abandoned tliis good principle of naming, as to have 

 fetaincd it, only for three of his Strata, viz. those of London, I'urbeck, and 

 D?rl)yshire : — Mr. Greenough has liowevcr adopted ir throughout (although 

 not with the best selection of Places in some instances) and for so doing 

 has my thanks : — for me to liave expected that this Gentleman should liave 

 acknowledged the sources of this suggestion, might perhaps be deemed un- 

 i ';asonable, by many of the M. G. S. 



ample 



