International Space Station 800 mm Photograph

Image credit:  Image Science and Analysis Laboratory, NASA Johnson Space Center (http://eol.jsc.nasa.gov)

WISE COUNTY 33.22N, 97.59W

The link is to a  description of the Graford Formation and its sponges..

1X MAGNIFICATION (RED LINE   = 1MM)

2X MAGNIFICATION (RED LINE   = 1MM)

3X MAGNIFICATION (RED LINE   = 1MM)

3X MAGNIFICATION (RED LINE   = 1MM)