8 R. B. Oldham — Essays in Theoretical Geology. 



1832. — 13. Trichiosoma lucorum, the Pupa and Tmago of, a Habitat of, and tlie 

 destruction of by one of the Ichneumonidte. Mag. Nat. Hist. yoI. v. 

 pp. 85, 86. 



14. Luminousness of the Sea. Ibid. vol. v. pp. 302, 303. 



15. Origin of the Crag Stratum of Norfolk. Ibid. vol. v. pp. 544, 545. 



16. Sir John Byerley's Theory of verifying Dates by calculations on the 

 Precession of the Equinoxes. Ibid. vol. v. p. 761. 



1833.— 17. An Outline of the Geology of Norfolk. 4to. and Svo. Norwich. 



18. The Natterjack in Norwich. Mag. Nat. Hist, vol vi. p. 457. 



19. Eemarkable Meteor seen from Norwich, Dec. 19th, 1832. Ibid. p. 463. 

 [Also Letter in ' East Anglian,' 1832, on this subject.] 



1834. — 20. Drawing of Two Steelyard Weights, one of which was found at Catton ; 

 exhibited by Mr. Samuel Woodward. [Communicated Feb. 2nd, 1832.] 

 Archseologia, vol. xxv. p. 589. 



21. An Account of certain Judicial Proceedings at Norwich, at the com- 

 mencement of the Usurpation, copied from a Manuscript written about 

 1675, in the possession of Edward Steward, Esq., of Norwich. Com- 

 municated by Mr. Samuel Woodward. [April 12th, 1832.] Ibid. 

 pp. 591-594. 



22. Sketch of an Ancient Sword, found in the Bed of the Eiver Tare, at 

 Thorpe. [Communicated Dec. 12th, 1833.] Ibid. pp. 618, 619. 



1835. — 23. Some Eemarks upon the Crag Formation of Norfolk and Suffolk. 



Phil. Mag. series 3, vol. vii. p. 353. 

 1836. — 24. On the Crag Formation; in answer to Mr. Charlesworth's "Eeply." 



Ibid. vol. viii. p. 138. 



25. An Account of some Discoveries made in excavating the Foundations 

 of Wymondham Abbey, with a Plan and Description of the Eeligious 

 Establishment. [Communicated December, 1834.] Archseologia, vol. 

 xxvi. pp. 287-299. [Also Letter on this subject to Editor of " Norwich 

 Mercury," dated 30th December, 1833.] 



26. Modern Conglomerate at Cromer. Mag. Nat. Hist. vol. ix. p. 47. 



27. Evidence in argument that remains of Mastodon giganteus and Mastodon 

 latidens have been found in the Tertiary Beds of Norfolk. Ibid. p. 151. 



1838. — 28. Ancient Swords, found near Norwich. [Communicated November 16th, 



1837.] Archseologia, vol. xxvii. pp. 435-437. 

 1842.— 29. The Norfolk Topographer's Manual: beiug a Catalogue of the Books 



and Engravings hitherto published in relation to the County. The whole 



revised and augmented by W. C. Ewing. 8vo. London. 

 1847. — 30. The History and Antiquities of Norwich Castle. Edited by his Son 



[B. B. Woodward]. 4to. London and Norwich. 



II. — Essays in Theoretical Geology. 



By E. D. Oldham, A.E.S.M., F.G.S., 



of the Geological Survey of India. 



3. The Age and Origin of the Himalayas, with Especial Eefek- 



ENCE to the Eev. 0. Fisher's Theory of Mountain Formation. 



Introductory. 



IT has become one of the truisms of geology that India, like Gaul, 

 is divided into three parts, the Peninsular, the Extra-peninsular, 

 and the Indo-gangetic alluvium. 



Of these the first, the Peninsular, has been dry land since the 

 Palasozoic period at least. It consists of a core of highly metamor- 

 phosed and contorted gneiss, on which are the remains of a skin of 

 sedimentary rocks of various ages, and a vast expanse of trappean 

 outbursts. Except in the Aravallis, the beds are but slightly dis- 

 turbed, and the whole area has evidently been in a state of quiescence 



