overburthen

Noun

 * 1) * 1832, John W. Colenso, "A Description of Happy-Union Tin Stream-work at Pentuan" in Transactions of the Royal Geological Society of Cornwall, T. Vigurs, Vol. 4, p. 38
 * The overburthen contains no sea-sand, but is composed of silt and river gravel.
 * 1) * 1832, John W. Colenso, "A Description of Happy-Union Tin Stream-work at Pentuan" in Transactions of the Royal Geological Society of Cornwall, T. Vigurs, Vol. 4, p. 38
 * The overburthen contains no sea-sand, but is composed of silt and river gravel.