yields are as follows: Corn, from 40 to 60 bushels per acre; wheat,
from 15 to 25 bushels per acre, and clover and grass, from 1-1/2 to
2-1/2 tons of hay per acre.

The Penn clay is the most highly prized soil of the Piedmont region of
Loudoun and brings the highest prices.


_Penn Stony Loam._

The Penn stony loam consists of from 8 to 12 inches of a red or
grayish heavy loam, somewhat silty, underlain by a heavier red loam.
From 10 to 60 per cent of gray and brown fragments of Triassic
sandstone, ranging from 1 to 6 inches in thickness, cover the surface
of the soil. The color is in general the dark Indian-red of the other
soils derived from Triassic sandstone, being particularly marked in
the subsoil.

This type occurs in the southeastern part of Loudoun, on the Piedmont
Plateau. It occupies three small areas whose total extent probably
does not exceed two and one-half square miles. It is closely
associated with the Penn loam and grades gradually into that type. The
only great difference between the two is the presence of sandstone
fragments in the Penn stony loam.

The topography varies from gently rolling to hilly and ridgy, with
slopes that are sometimes rather steep. However, the surface is not so
broken as to interfere with cultivation, and the slopes are usually
gentle.