302 OCCURRENCE OF DIATOMS, RADIOLARIA AND INFUSORIA, 



described by Hinde,* Riist,t Cayeux,! and others. A general 

 summary of the more recent literature relating to fossil radiolaria 

 is given by one of us in papers read before this Society in 1896.§ 



It will not be out of place to casuall}^ refer to the great series 

 of radiolarian-bearing rocks of Devonian age occurring at Tam- 

 worth, the micro-fauna of which has been so thoroughly investi- 

 gated by Dr. Hinde. 



As regards radiolarian rocks in Australia which may belong to 

 the same geological system as those of the Maranoa River, 

 Queensland, the fact may be mentioned that the rock from Fanny 

 Bay, Port Darwin, is considered to be very probably of Upper 

 Cretaceous (Desert Sandstone) age, and Dr. Hinde, in describing 

 it, says : — " The rock in question is of a dull white or yellowish- 

 white tint, in places stained reddish with ferruginous material; 

 it has an earthy aspect, like that of our Lower White Chalk, 

 though it can be scratched by the thumb-nail." Tenison- Woods, 

 in his " Report on the Geology and Mineralogy of the Northern 

 Territory," described the cliffs as being capped by beds of compact 

 white or yellowish-white rock, for the most part magnesite. Dr. 

 Hinde, in speaking of the mode of occurrence of the rock, says : — 

 "Mr. Bassett-Smith states that the white radiolarian rock forms 

 a very prominent feature in the steep cliffs, from 30 to 50 feet in 

 height, which border the harbour of Port Darwin. The rock is 

 exposed for many miles on the Fanny Bay side of the harbour, 

 and extends continuously from point to point across the bay. A 

 section in the cliff at Fanny Bay consists at the base of mica-schist 



* Note on a Radiolarian Rock from Fanny Bay, Port Darwin, Australia. 

 (^uart. Jouru. Geol. Soc, 1893, xlix., pp. 221-226, pi. 5. 



t Palaeontographica, 1885, xxxi., pp. 269-322; 1888, xxxiv., pp. 181-213; 

 1892, xxxviii. 



X Contribution a I'^tucle micrographique des Terrains Sedimentaires. 

 Mem. Soc. Geol. Nord., 1897, pp. 185-206, pis. 7, 8. 



§ David (T. W. E.), The Occurrence of Radiolaria in Palaeozoic Rocks in 

 N.S. Wales. P.L.S.N.S.W., xxi., pp. 553-570, pis. 37, 38. David and 

 Howchin, Note on the Occurrence of Casts of Radiolaria in Pre-Cambrian (?) 

 Rocks, South Australia. Ibid., pp. 571-583,'pls. 39, 40. 



