134 



THE aEOLOGIST. 



leave their peculiar imprints. While the mud is drying, it separates 

 and produces what are termed sun-cracks, whicli are always present 

 in the layer which has preserved foot-marks in the sandstones of the 

 Connecticut Yalley." 



That the footprints and rain-marks of the Connecticut sandstone 

 might have been made on the banks of a river or estuary, Sir C. Lyell 

 has shown in his ' Travels in North America,' vol. i. p. 254, and vol. ii. 

 p. 168 ; ' Principles of Geology,' 9th edit., p. 203 ; ' Anniv. Address 

 to the Geol. Society, 1851 ;' ' Manual of Geology,' 5th edit., pp. 318, 

 384 ; and * Notices of the Eoyal Institution,' vol. i. p. 57. Dr. James 

 Deane* (who first drew the attention of naturalists to these fossils) 

 and Prof. Hitchcock,! in America, have explained and illustrated 

 these vestigial phenomena with great labour and sldll. 



In Britain we have a plentiful supply of equally obscure phenomena 

 in tlie Arenicoliies, Scoliies, Helminthites, and Vermiculites of the 

 Silurian, Carboniferous, and other rocks, and in the foot-tracks in the 

 Millstone-grit of Tintwistle, in the Coal-measures of Dalkeith and 

 the Porest of Deane, in the Permian sandstones of Corncockle Muir, 

 Dumfriesshire, and other places, in the New Eed Sandstone of Au- 

 nandale, in the New Eed deposits of Cheshire and Warwickshire, in 

 manifold markings on the Porest-marble, and in the great trifid foot- 

 marks and other prints in the Wealden of Sussex. That these great 

 trifid footprints, the casts of which were found by Mr. E. Tag- 

 gdiVtX and Mr. Beckles,§ and carefully described by the latter, should 

 prove to have been made by the three-toed Iguanodon is not unlikely, 



rig. 7. 



* ' Boston .Tourn. Natural History Soc.,' vol. v. p. 282. 'Mem. Americ. Acad. Arts 

 and Sc.,' new series, vol. iv. p. 209 (9 plates). ' Journ. Acad. Nat. Scienc, Philadel- 

 l)hia,' 2_nd series, vol. ii. p. 71 ; vol. iii. p. 173. ' Silliman's Journal,' vol. xlv. p. 178 ; 

 vol. xlvi. p. 73 ; xlvii. p. 292 ; xlviii. p. 158; xlix. p. 213 ; new series, vol. iii. p. 75 ; 

 V. p. 40. ' Ichnographs iVom the Sandstone of Connecticut River/ 1861, Boston (46 

 plates.) 



t 'Memoirs American Academy,' new series, vol. iii. p. 129. 'Boston Journ. Nat. 

 Hist. Soc.,' vol. vi. ]). 111. ' Elementary Geologv,' new edit., 1860, p. 181. ' Report 

 on (he Geology of IMassachnsctts,' p. 477, etc. ^''Geology of the Globe,' p. 98. ' Silli- 

 man's Journal,' vol. i. p. 105 vi. pp. 1, 201; vii. p. 1 ; xxix. p. 307; xxxi. p. 174; 

 xxxu. p. 174; xlvii. p. 292 ; 2nd srries, iv. p. 46. 



X .lonrn. Gcol. Soc, vol. ii. p. 207. 



§ Quad. Journ. Geol. Soc, vol. vii. p. 117 ; viii. p. 396 : and x. p. 456, pi. 19. 



