THE HAWKESBURY SANDSTONE. 81 
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being found over hill, plain, and valley. Much of the material 
composing it is rounded and waterworn, and Mr. Selwyn considered 
that there was evidence of too extensive and powerful an action to 
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marine remains are known to us of such a character. 2nd— 
s formation such as I shall now describe. : 
Mexican eolian strata.—It has already been remarked that m 
Many places in Europe there exists a recent formation at various 
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: 500 feet of thestrata. A similar deposit is described * ne 
_ “feaan Archipelago, It is a reddish loam lying in horizonta S 
oe. the highest altitudes. The explanation of these and similar facts 
ee been given by Mons. Virlet-d’Aoust as the result of his obser- 
