100 Report on the Coal said to have been found 
continuous. From Low Head, on the eastern bank, green- 
stone lies in one continued mass all the way up. Traces of 
sedimentary deposits are visible, however, under the green- 
stone at several points on the margin of the river between 
Point Effingham (opposite to Middle Island) and the “ Hast 
Arm” of the Tamar: they consist of arenaceous clay beds 
and hard, compact, ferruginous grits, rich enough in zron to 
be applied, if required, to the purposes of smelting as an ore 
of that metal. Entering the ‘‘ West Arm” of the estuary, 
sandstones and brown arenaceous shales are found extend- 
ing nearly to the junction of ‘‘ Anderson’s Creek,” within 
a mile of York Town. ‘These beds dip regularly, but 
slightly, to the eastward. Near the creek some soft blue 
argillaceous beds present themselves, and in the mouth of 
the creek alternate with layers of calcareous conglomerate, 
enclosing small Twrritelle : soft schistose yellowish clays 
succeed, and are in their turn replaced by a long series of 
slightly inclined beds of gray compact and very hard lime- 
stone, some of the layers of which yield Spirifere. This 
limestone passes from a close, fine-grained homogeneous 
rock into beds of fine conglomerate: the fine-grained breaks 
with difficulty into conchoidal fragments, and yields to the 
smart stroke of the hammer a peculiar odour, not unlike that 
of resin. 
Time did not allow me to trace the rivulet to the Asbestos 
Hills,—a range which, from its composition and structure, 
and the various products it is known to yield, must be well 
worth a careful examination wherever sections of the rocks 
can be obtained. In the channel of Anderson’s Creek they 
are clearly exposed ; and it was with great reluctance that, as 
night closed in, I abandoned the place without being able to 
refer the series of nearly horizontal beds there to any for- 
mation already familiar to me. ‘That ramification of the 
