Spherules on Shatter Cone Surfaces from the Vredefort Structure, South Africa

Science  12 Nov 1976:
Vol. 194, Issue 4266, pp. 724-725
DOI: 10.1126/science.194.4266.724


Spherical particles of silicate composition occur on the surface of some shatter cones from the collar rocks around the Vredefort structure, South Africa. They are best developed on shatter cones from a shale horizon but are also found on more arenaceous rocks and banded ironstones. They have not been found on shatter cones from the purer quartzites.