TRAPPEAN— TRIGONOARCA. U9 



cellanites " are rhyolitic tuffs differing essentially in degree of 

 coarseness. True felsites and rhyolitic lavas have been found 

 associated with the tuffs in one place in the Son valley. 



'• Trap-Shotten " gneiss.— Term used by W. King and E. B. Foote 

 (Mem., Geol. Surv., Ind., IV, 271, 1864) for certain gneisses in 

 the Salem district, which appeared to be impregnated along 

 bands with veins of dark-coloured, compact trap. The supposed 

 trap was shown by T. H. Holland (Mem., Geol. Surv., Ind., 

 XXVIII, 198, 1900) to be mylonite formed along planes of dis- 

 location. 



Traumatocrinus limestone.— Name applied to a part of the Upper 

 Trias of the Himalaya from the characteristic crinoid. The 

 fauna was originally described by E. v. Mojsisovics and A. Bittner 

 (Pal. Ind., xv, III, Part 1 ; ibid., Part 2). It was correlated with 

 the Julie substage of the Upper Trias of the Alps, a correlation 

 fully confirmed by C. Diener's examination of the more extensive 

 collection of A. v. Krafft (Pal. Ind., xv, VI, Memoir 2). 



Tremenheerite. — Mineral name used by H. Piddington (Joum. As. 

 Soc, Beng., XVI, Part 1, 369, 1847) for a carbonaceous rock from 

 the Tenasserim division, South Burma. The original mineral 

 was not preserved in the Calcutta Museum (F. B. Mallet, Man. 

 Geol., Ind., Part IV, 1887, 11), and its exact nature cannot now 

 be verified, but it is evidently, from Piddington's analysis, a 

 substance allied to impure graphite. The name is given after 

 G. B. Tremenheere. 



Trichinopoly fossil limestone.— Briefly referred to by T. J. New- 

 bold (Joum. Roy. As. Soc, VIII, 218, 1844) as similar in some 

 respects to the fossiliferous limestone of Pondicherry, but, with the 

 imperfect information then obtainable, of doubtful age. 



Trichinopoly Stage. — One of the divisions of the Coromandel Cre- 

 taceous beds named by H. F. Blanford (Mem., Geol. Surv., Ind., 

 IV, 23, 107, 1862) from the district in which the beds occur. The 

 lower beds agree with the Turonian of Europej while the upper 

 beds are lower Senonian (F. Kossmat, Eec, Geol. Sxirv., Ind., 

 XXVIII, 40, 1895). 



Trigonoarca beds. — Name given by F. Kossmat (Rec, Geol. Surv., 

 Ind., XXX, 54, 58, 1897) for beds in the Pondicherry Cretaceous 

 formations included in Horizons D and E of H. Warth (Rec, 

 Geol. Surv., Ind., XXVIII, 17, 1895). According to Kossmat, 

 the Trigonoarca beds correspond to a part of the Ariyalur stage 



