THE HAWKESBURY SANDSTONE. 85 
sandstone which abounds in other parts of the continent. Where 
the strata contained a great deal of iron, there were formed siliceous 
concretions which resisted decomposition, while the rest of the 
rock fell away. * * * The red sand is certainly derived from a 
ce such a shingle, but there it would be of small width, and 
We should find marine remains, which here we do not. An ocean 
Would not produce such results, and nothing of less extent than 
an ocean will meet the requirements of such an area ; and then 
the presence of land plants, and the absence of marine remams, 
meet us again to destroy the ocean theory. ’ 
_ Lee action.—I have now a few words to say about the ice cates 
n 
tion for these rocks. It is true that there is a v ow 
nd fossils found in marine ice deposits, and also that they are quite 
“wanting from some glacial beds; but, as a di hed geolo- 
ar 
Which are as clear indications of ice action as marine shells are of 
the presence of the sea. These indications are—(1) Till; (2) Mor- 
ws (3) Glacial mud; (4) Boulder clay; (5) Ice grooves, 
| : | are gments which are rounded, and in fact nearly all of them, 
Sera ig and ines are co: 
r 
T 
show 
Show ic polishing. Mora psahyionesi 
Cfearth and stones jumbled together without regard to size, 
: . 
The fragments are less grooved or scratched than in 
se they have ridden on the top of the glacier; but 
78 arranged in lines along a valley, or in a 0e- 
end of it, an extremely 
