NOTE ON TERTIARY EXPOSURES IN THE HAPPY VALLEY 
DISTRICT, WITH DESCRIPTION OF A NEW SPECIES 
OF SEPTIFER. 
By HERBERT BASEDOW. 
[Read October 4, 1904.] 
PLATES XXXV. AND XXXVI. 
The district which forms the subject of the present note 
is situated about eight miles south of Adelaide, adjacent to 
the main South Road and the Happy Valley Reservoir. Mr. 
H. Y. L. Brown, the Government Geologist, has outlined the 
geological features of the district, and the late Professor 
Ralph Tate placed in the Geological Museum of the South 
Australian School of Mines a number of tertiary fossils 
which were obtained during the construction of the Happy 
Valley Reservoir. The names of these species appear in the 
catalogue of tertiary fossils in the Museum of the School 
of Mines, compiled by Mr. G. B. Pritchard, and published 
in the Annual Report for 1891. The bed-rock—within a 
valley of which the tertiary beds were deposited— consists of 
coarse, arenaceous, more or less decomposed, clay slates, in 
parts spangled with tiny flakes of mica (secondary). The 
beds vary in colour through yellow, brown, blue, and choco- 
late, and are highly ferruginous. 
TERTIARY.— Focene. The deposits of this age are chiefly 
exposed in cuttings, and vary from a compact, greenish, 
chaleedonised sandstone, with fossils wholly converted into 
chaleedony, through a more friable, decomposed, white, 
"chalky" matrix (also fossiliferous), to a glauconitic, iron- 
shot sandstone, with casts and impressions of shells preserve: 
in glauconite and limonite. A complete pseudomorphous re- 
placement of the molecules of the original caleium-carbonate 
by chalcedony, glauconite, and limonite is thus exemplified 
in one and the same bed. 'The most inland exposure known 
in this district was passed through during the excavation of 
the contour-channel around the Happy Valley Reservoir, 
which intercepts the surface drainage. Fossils found at this 
spot are mostly pseudomorphs in chalcedony, the specific 
identifications of which are in many cases quite impossible 
