Your rock looks like coarse grain sandstone with ripple marks, but a description of the minerals could clarify if it is a volcanic sandstone or, conversely, it is a quartz sandstone not related with volcanism.
To determine the origin of the sandstone grains you should make a fresh-cut of the rock and, if possible, make a picture too of what a magnifying glass shows.
It probably comes from Woodbine Formation at Denton Country, Texas, USA.
That formation has sandstones (both quartz and volcanic ones) from coastal environments, as USGS describes it, where hydrodynamics could have developed the ripple marks, that are little dunes the current form on sands or muds.
"Woodbine Formation: NE Texas. Texarkana Sheet (1966) Woodbine Formation--various interlensing sequence of nonmarine, brackish-water, and marine beds of sand, clay, sandstone, and shale 350-600 ft thick. Woodbine fossils include ammonites, gastropods, pelecypods, brachiopods, and foraminifers. Contains volcanic sand and tuff, coarse grained, crossbedded, dk green and olive green; fossil plants and a few marine megafossils; thickness 500 ft, thins eastward."
Source: Geology of Denton Country, Texas. United States Geological Survey
That formation is digged by pool companies as shown in this maps: