75 



described hereafter), and the lowest part of the "grits" has 

 been introduced in fig. 2 under the name Ochreous Clay, but as 

 this and the other deposits are seen at another locality in 

 normal juxtaposition, the following applies to the same, viz., 

 the coastline in the Hundred of Muloowurtie, between Eogue's 

 and Muloowurtie Points. 



About one and a half miles south of Ardrossan, the strata 

 forming the coast cliffs thin out or curve downwards to within 

 a few feet of high water mark, and re-appear afterwards at 

 Eogue's Point with an ascending angle of about two or three 

 degrees, measured in the direction of the coast, viz., nearly 

 ~N. to S. Two miles further the whole series shows several 

 curvatures, the height of the cliff at the same time decreasing 

 rapidly from 70 or 80 feet to fifteen or twenty, and close by 

 marbles appear above the sea level underlying unconformably 

 the above. Near Muloowurtie Point a peculiar sandstone 

 occupies locally either the lower part of the "Ardrossan clays " 

 or the upper of the "Turritella grits," most likely the latter. It 

 consists of small, equally- sized round grains of pure silica, 

 resembling very much, where weathered, the roe of fish. It:a 

 dimensions vertically are inconsiderable, being only a few feet 

 in thickness, and contains no fossils. 



Some distance further south a thin layer of ferruginous 

 sandstone appears instead, containing abundantly casts and 

 impressions of large Turitellce and small bivalves (cockle-like). 

 In structure it resembles exceedingly the so-called Upland 

 Miocene ironstone near Tanunda, Nuriootpa, &c. ; but at these 

 places no undoubted fossils as far as I know are associated 

 with the same, excepting some specimen of wood transformed 

 into oxide of iron, obtained by me. A similar rock has been 

 observed by me, but without fossils, in a small patch in Section 

 214, Maitland, Torke's Peninsula. Between Eogue's Point 

 and Muloowurtie Point the base of the series of older Tertiary 

 strata occurs at sea level, resting on the Ardrossan Marble, and 

 is succeeded by the rest up to the " Turritella Grits" at 40 feet 

 elevation. The " Turritella Grits " have (fig. 5) here a thickness of 

 some 20 feet, the greatest measured vertical thickness being 26 

 feet 6 inches; and consist of two or three distinct unfossiliferous 

 clays and bands of grit from three inches to a foot in thickness, 

 the uppermost and the lowest of which can be traced for long 

 distances, while the intermediate ones partly change into white 

 marls or cease and re-appear irregularly, or disappear alto- 

 gether. They alone contain fossils, and all of the same 

 description. Immediately, below and conformably thereto, 

 follows a layer of ochreous clay (fig. 5) without fossils, and 

 of a thickness (where measured) of six feet six inches, but much 

 more at other places. This overlies, likewise conformably, a 



