GEOLOGICAL SOCIETY OF MANCHESTER. 



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Barker, divides at Mount Torren (nine miles north of Mount Barker), 

 the sources of the Torren s, the Onkaparinga, and the Bremer, soon 

 afterwards assumes a northerly course, parallel to the Murray, at about 

 thirty miles miles of distance from it ; inclines to the westward of north 

 when nearly west of the great south bend ; and terminates its northerly 

 course abruptly in about 30" 20', 65 miles N. W. by W. of the great 

 bend at Mount Bryan (a mountain probably 2,400 feet in elevation.) 

 From Mount Bryan, the great dividing range takes a sudden turn to the 

 westward, and appears to join Flinder's range near the shores of 

 Spencer's Gulf, in about latitude 33" 18'. From near this last point, it 

 throws out a range, of which most of the peaks must be at least 2,000 

 feet in elevation, which, running to the E. by N. and E. N. E. passes 

 to the northward of Mount Bryan, and continuing the same course to 

 the limit of sight from Mount Bryan, forms, as far as it extends, a 

 northern boundary to the immense plains of the Murray fossil formation. 

 These ranges are, or appear to be, everywhere composed principally of 

 slate. 



Mr. Binney then proceeded to direct attention to the fossil shells on 

 the table. 



These (he said), were found at the town of Adelaide, immediately be- 

 hind the South Austrahan Arms Inn. There, on sinking a well for 

 water, they were met with at a depth of 160 feet from the surface^ 

 The mass appears to consist of a vast number of shells, cemented toge- 

 ther with carbonate of lime and sand, containing a considerable amount 

 of per- oxide of iron. It bears a great resemblance in its appearance 

 to our crag formation, though the organic remains which it contains 

 have not been yet identified with those of any European formation. The 

 fossils which it contains, and for the most part of which it consists, are 

 a large ostrca, a pecteri, fragments of large bivalves, two specimens of 

 cidaris (the spines of an echinus,) one having a cancellated structure and 

 the other plain, a parasitical coral, several bones of fishes (chiefly ribs), 

 a very minute bivalve shell, and a small univalve, resembling in ex- 

 ternal appearance a nautilus. These last-named minute fossils I found 

 in the sand, deposited in the interior of the larger bivalves. The 

 small bivalve is about one-third of a line in length, and a line in 

 breadth. From the imperfect condition of the open valve, nothing can 

 be determined by its hinge, so as to decide to what genus it belongs. 

 The small univalve is the most remarkable shell, and it is to it that I 

 shall direct my attention. It is scarce half of a hne in diameter, is of a 

 nearly lenticular shape, and has its outside marked with fine wavy lines 

 of growth^ forming minute ribs across its surface. In the farrows be- 



