About the Gravel or conglomerate (2nd option), FGDC 602 hatch pattern
Gravel or conglomerate (2nd option): dense scattered circles among fine dots. FGDC geologic map lithology pattern 602. Redrawn from the USGS chart.
Kind: a repeated motif that does not fill the plane.
The download is one AutoCAD .pat file. Downloads are metered; a Hatchy Pro license lifts the limit.