Where blue gravel or hardpan and clean bank gravel are procurable, a good road may be made by mixing the two together.
He came to a dark patch on the hardpan and strided over it, unheeding.
Thirty miles east along this hardpan Spur was his home territory and he followed along the base of it.
When small lakes dry up, they leave a salt crust or hardpan.
The cost of specially made grubs for digging in hardpan is about $26 per dozen.
For hardpan, shale, loose rock and similar materials, ample strength of teeth and dipper is of greater importance than its shape.
hardpan, the hard, unbroken layer of earth, below the mould or cultivated soil.
Elsewhere the hardpan or bedrock must have been exceptionally level and near the top of the ground.
hardpan or stone screenings are much preferred for this purpose if they can be had.
Three persons worked together, one to clear off the sand on the ground to within six inches of the hardpan.
A hard, usually clay-rich layer of soil lying at or just below the ground surface, in which soil particles are cemented together by silica, iron oxide, calcium carbonate, or organic matter that has precipitated from water percolating through the soil. Hardpans do not soften when exposed to water. Also called caliche.