In other cases it is believed that deep circulation of ordinary ground-waters may pick up dispersed mineral substances through a considerable zone, and redeposit them in concentrated form in veins and other trunk channels.
"The Economic Aspect of Geology"
C. K. Leith
This false bedding is due to the sand having been thrown down in waters agitated by strong currents that swept over the spot, now in one direction and now in another, scattering at one moment half the sand they had just piled up one way only to redeposit it the next minute in another.
"Sea-Weeds, Shells and Fossils"
Peter Gray B. B. Woodward