About the Gravel or conglomerate (1st option), FGDC 601 hatch pattern
Gravel or conglomerate (1st option): scattered small circles among fine dots. FGDC geologic map lithology pattern 601. 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.