I 



PRESIDENT S ADDRESS— SECTION C. 147 



Some distance northward, on the Wyndham Eiver, is a boulder 

 bed in the limestone series. The bed, which at this spot attains no 

 greater thickness than 3ft., is crowded with boulders and pebbles of 

 granite and crystalline rocks embedded in a calcareous fossiliferous 

 matrix, a photograph of a specimen of which contains fragments of 

 Spirifera, Producius and Polyzoa, in addition to Aviculopecten tenui- 

 collis, will be found in the Annual Report of the Geological Survey for 

 1900. The pebbles and boulders have a large proportion of smooth 

 and polished faces. The flats in the neighborhood are covered with 

 boulders and blocks of crystalline rocks, evidently derived from the 

 weathering in situ of a bed of conglomerate, which has a dip of about 

 3° to the south-west. In the bed of the Wyndham River beds of flaggy 

 sandy limestone are to be observed passing beneath the boulder beds, 

 indicating, what is perfectly obvious from numerous sections, that the 

 glacial conglomerate does not lie quite at the base of the Carboniferous 

 rocks. 



Associated with the boulder beds of the Wyndham River are the 

 following fossils : — Hexagonella dendroidea, Hudleston, sp. ; Pleuro- 

 phyllum Australe, Hinde ; fragments of Crinoid stems and Polyzoa ; 

 Spirifera musakheylensis, Davidson ; Spirifera Hardmani, Foord ; 

 Spirifera lata, McCoy ; Reticularia lineata, Martin sp. ; Athyris Mac- 

 cleayana, Eth. fil. ; Choneies Pratti, Davidson ; Productus {cf P. 

 tenuistriatus), Foord. 



Northwards from the Wyndham River the debris of the boulder 

 bed makes its appearance in great force. The flaggy sandstones 

 immediately underlying it are covered with large boulders of crystalline 

 rocks. Near Barragooda Pool, on the Arthur River, a thick bed of 

 limestone directly overlies the boulder bed. This limestone has yielded 

 the following fossils : — Evactinopora crucialis, Hudleston ; Bhomho- 

 pora tenuis, Hinde ; Athyris Madeayana, Eth. fil. var. ; Productus 

 semireticvlatus, Martin ; Aidosteges, sp. nov. : Dielasma, sp. ind. 



A few miles to the north of this, near Trig. Station K.34, the 

 Carboniferous beds are. faulted against the older crystalline rocks, 

 which, in this locality, consist of quartz and mica schists, associated 

 with either dykes or sills of porphyry. 



In the southern branch of the Minilya River, near Trig. Station 

 K.49, the boulder bed is seen overlying beds of limestone and shale. 

 The debris of the boulder bed consists of a heterogeneous collection of 

 all sorts of crystalline and metamorphic rocks, and contains numerous 

 ice-scratched pebbles — photographs of several typical examples appear 

 as Plate IV. of the Annual Report of the Geological Survev for 

 1900. 



It may be mentioned in this place that in a deep bore put down 

 by the Government at Pelican Hill, near Carnarvon, that these Carbo- 

 niferous or Pernio- Carboniferous beds were met with beneath fossili- 

 ferous Mesozoic rocks at 1,406ft., and continued to a 3,011ft., the 

 present depth of the bore. The Carboniferous strata are represented 

 by calcareous shales and limestone. The cores from the bore have 

 yielded Spirifera, Aviculopecten, Anthrocoptera, and Favosites. The 



