251 
The presence of large quantities of glauconite is of in- 
terest. Appearing, as it does, as "pockets" of over a foot 
in thickness, it would, at first sight, suggest a contempor- 
aneous deposition with the sandstone. Deposits of glau- 
conite are at the present day usually found at depths of from 
700 to 800 fathoms.* The fact, moreover, that the fossi! 
casts of shells are pseudomorphs in glauconite further in- 
dicates a transportation and infiltratory redistribution of the 
mineral, probably in a state of suspension in percolating 
water as an exceedingly fine powder, capable of passing with 
the water through the smallest cracks and crevices of tle 
rock. 
The occurrence of subangular, or even angular, pebbles 
in the sandstone has been alluded to. This fact, taken ın 
conjunction with the abundant drift bedding and signs of 
contemporaneous erosion, strongly suggests action by an 
irregular agent. The entire absence (or practically so) of 
fossils in the upper portions of the sandstone, a formation 
which appears conformable with the true Eocene below. 
points to a marked change in the sequence of events which 
produced a change ın the sedimentary deposits. 
Recent.—Alluvium, sand, and black soil occupy the greater 
portion of the low-lying areas and depressions. The varying 
character of the fertile loams filling the valleys has sug- 
gested a lacustrine origin.t On the calcareous soils a deposit 
of nodular and earthy travertine occurs, which has been pro- 
duced by lateral secretion from the metamorphic limestones 
on the west. 
SEPTIFER SUBEENESTRATUS, Sp. nov. 
Shell inequilateral triangular, fairly 
convex; umbo strongly curved and mar- 
ginal; dorsal line flat-convex ; ventral mar- 
gin straight or slightly inwardly indented. 
Ornamented with stout, longitudinal, 
angulated ribs, sometimes appearing bifurcated without 
being confluent, straight in centre, curved dorsally, the 
median ribs the thickest; also with finer concentric lines, 
occupying the interspaces and not traversing the ribs; few 
conspicuous folds of growth. 
* Murray: Rep. Challenger Expedition and Proc. Roy. Soc. 
(London), vol. xxiv. 
t Since the completion of the Happy Valley Reservoir a slight 
eakage of water southwards has been the means of destroying the 
vegetation along the course of its flow. The erystallisation of salt 
at the surface along this course is noteworthy. 
