Results: 1 - 3 of 3
Jan 23, 2020
Data
… Industrial Mineral Deposits and Occurrences (AMDO) digital … marl, tufa, phosphate, silica sand, pumicite, sulphur, fly ash, humalite, and sand and gravel. This dataset is part of a …
Apr 23, 2017
Data
… unit (SU) 3, which contains sand and/or gravel resting on the floors of …
Apr 23, 2017
Data
… unit (SU) 5, which contains sand and/or gravel confined to modern valleys, …