318 A. Tylor on the Amiens Gravel. 
ence of chalk is concerned. The unrolled condition in which 
the large pieces of chalk in the gravel generally occur proves — 
the local origin of the chalk, and that it has been brought 1 
down from the high lands and not thrown up by the river. 
We might expect an important difference in mineral ¢ i 
ter between the gravel and loess at the respective heights of 150 — 
and 75 feet above the sea. I have compared the gravel of St- 
Acheul, 140 feet above the sea, with that at Montiers, from 70 
to 80 feet above the sea, as carefully as I could, in order to find 
some marked distinctions, but up to the present time without 
success. I have sketched a piece of gravel ‘at St.-Acheul, 140 
feet above the sea (Plate IV, fig. 12), and a piece in La New 
ville, 105 feet above the sea, and immediately north (fig. §). 
Fig. 8.—Section in La Neuville Ballast-pit, Loess and Gravel, 
but there is still more variety in the gravel section of apart of 
St.-Acheul, 200 yards to the east, at a height of 145 feet above 
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would enable us to distinguish any particular level. ae to 
The large stones of Grés are abundant in all the quat a od 
made notes of the numbers and sizes of all I observed, a 
in the on 
above the railway as below it, and range up os ‘Monten 
d one Gris : 
northern pits as in those at St.-Acheul. I observe 
at La Neuville partly covered by loess, th 
being on gravel; but elsewhere the Gres stones 
the gravel. : earth at 
I have mentioned the loess being a very good bpetienie | 
a point 120 feet above the sea in Montiers. The color are 
terial of the loess is generally a dull brown, varying ™ 
