346 



Notes on the Government Borings at 

 Tarkaninna and Mirrabugkinna, with 

 Spegial Referenge to the Foraminifera 



OBSERVED therein. 



By Walter Howchix, F.G.S. 



[Read October 17, 1893.] 



I have been indebted to Mr. J. W. Jones, Conservator of 

 Water, for samples of the two bores which have yielded the 

 results detailed below. In nearly every instance the quantity of 

 material available for treatment has been exceedingly small, the 

 samples not averaging, in the case of Tarkaninna, more than 

 about a quarter of an ounce in weight when washed. The present 

 list of occurrences cannot, therefore, be regarded as in any sense 

 an exhaustive record of the foraminiferal fauna of the beds in 

 question ; but in our present limited knowledge of the fossils 

 that pertain to the extensive formations of Ci-etaceous age in 

 Central Australia they are worthy of record. 



MIRRABUCKIXXA. 



This bore is situated about 20 miles north of the head of Lake 

 Torrens, and 43 miles in a straiglit line south-west of Hergott. 

 Six samples in all were examined from this boring, tlie depths 

 being 40 ft., 50 ft., 95 ft., 100 ft., 128 ft., and 153 ft. respect- 

 ively. The marine remains, so far as the present investigations 

 have been carried, are limited to the first 50 ft. of the section, 

 and belong to the Foraminifera, small fish remains, and traces of 

 mollusca. 



Foraminifera. 



Reophax fusiformis. Will, (common). 

 Reophax scorpiurus, Montf. (conmion). 

 Haplophragmium agglutinans, crOrh. (rare). 

 Haplophragmium canariense, cVOrh. (common). 

 Planispirina celata, Costa (mod. common). 



Mollusca. 



Fragments of a small Lingula not uncommon at 40 ft. and 



50 ft. 



Pisces. 



Small fish remains are plentiful in the 50 ft. sample. These 



