Table 1

Sample location information and summary of shocked zircon search

SampleLatitudeLongitudeZrna, grains surveyedZrn, shockedZrn, % shockedDistance (km)
Middle Orange Riverb
14VD69S29°04.626′E23°37.358′115300761
09VD38S29°13.087′E23°21.045′48100776
09VD44S28°52.803′E21°59.145′379001054
09VD45S28°43.740′E20°59.142′41001202
09VD46S28°38.121′E21°05.377′133001219
subtotal2187
Atlantic coast and Lower Orange River, near Orange River mouthb
14VD77S28°33.344′E16°32.903′317410.031925
14VD76S28°34.015′E16°30.439′352001929
14VD80cS28°38.59′E16°28.32′274510.041939
09VD48cS28°38.59′E16°28.32′105510.091939
subtotal7326
Atlantic coast, south of Orange River mouthd
14VD79S29°15.180′E16°52.055′1700087
14VD86S31°15.357′E17°51.726′54900339
14VD89S31°42.321′E18°11.559′78300401
subtotal1502
Near the Morokweng impact structured
09VD52S26°35.153′E22°40.559′67001165
09VD51S25°47.282′E22°54.882′86001248
subtotal153
 Total1116830.03
  • a Zrn = zircon.

  • b Distance cited is from the Route 53 bridge in Parys to the sample location.

  • c Collected from a 2 km long sand spit at the Orange River mouth on the Atlantic coast; the location cited is in the middle of the sand spit.

  • d Distance cited is from the sample location to the mouth of the Orange River.