The following subdivisions have been recognized by Molengraaff Karroo System, Transvaal System, Vaal River System, South African Primary System.
Ac cording to Molengraaff it includes the two following series: - An upper group including the auriferous conglomerates of the Rand: Witwatersrand Series.
- Molengraaff considers the Barberton series to be the metamorphosed equivalent of the Hospital Hill series, while Hatch regards it to be older and to form a portion of his Archaean series (Swaziland schists) to which position it is here assigned.
The latest classification of Molengraaff subdivides the beds as follows: - Beaufort beds of Cape Colony.
Molengraaff, Geologie de la Republique Sud-africaine du Transvaal, Bull.
Molengraaff, but to be of older date by F.
Among papers in scientific periodicals may be mentioned articles by Adler, Ball, Baumhauer, Beck, Bonney, Brewster, Chaper, Cohen, Crookes, Daubree, Derby, Des Cloizeaux, Doelter, Dunn, Flight, Friedel, Gorceix, Gurich, Goeppert, Harger, Hudleston, Hussak, Jannettaz, Jeremejew, de Launay, Lewis, Maskelyne, Meunier, Moissan, Molengraaff, Moulle, Rose, Sadebeck, Scheibe, Stelzner, Stow.