Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . ncorrected aerial photograph.) The surface is littered with rusty-brown turritelid gastropods, heterodontbivalves, ostreids, bryozoans, selachian teeth and occasional specimens of thenautiloid Aturia lotzei. An important topographical feature is a low hillock inthe western part of the depression (Fig. 3), consisting of green, sandy silts andhard, greyish-white concretionary layers with abundant Tertiary fossils. As thisis the only major topographic feature in the depression, both the author andZiegler here searched in
Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . ncorrected aerial photograph.) The surface is littered with rusty-brown turritelid gastropods, heterodontbivalves, ostreids, bryozoans, selachian teeth and occasional specimens of thenautiloid Aturia lotzei. An important topographical feature is a low hillock inthe western part of the depression (Fig. 3), consisting of green, sandy silts andhard, greyish-white concretionary layers with abundant Tertiary fossils. As thisis the only major topographic feature in the depression, both the author andZiegler here searched in vain for the Rhynchostreon bed and incorrectly con-cluded that the material described by Haughton was probably reworked. The remains of the Cretaceous outcrop, at 27°2303S 15°2420E occursca 70 metres due east of an intersection in the narrow-gauge railroad amidstgravel dumps on the eastern slopes of the depression (Fig. 5). The intersection inthe narrow-gauge railroad is marked by dumped rails and sleepers, and is 84 ANNALS OF THE SOUTH AFRICAN MUSEUM >«L ??- #. <i*4. ,***SP~ Fig. 2. View of depression looking north. Eocene Section aL mfc *?*. ***f2irf&s &£• l\w J*s^#W!i% •*til* ? : -? Fig. 3. View of Tertiary hillock in depression. Vehicle tracks on right foreground for scale. CRETACEOUS DEPOSITS NEAR BOGENFELS, SOUTH WEST AFRICA 85 approximately 160 metres south of the Tertiary hillock mentioned above. Theremains of the Cretaceous exposure are represented by a few loose concretions,ca 20 cm thick, crammed with exogyrans (Figs. 4-5) littering the surface over anarea of about 5 m2. Abundant loose exogyrans occur both on the surface and inthe surrounding gravel dumps. An intensive search in this area for more of this material proved to benegative. DESCRIPTION OF STRATIGRAPHIC SEQUENCE The stratigraphic section presented in Figure 6 is very diagrammatic andcomposite, consisting of the section measured at the Cretaceous locality and alsoat the Tertiary hillock as sh
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Keywords: ., bookcentury1800, bookdecade1890, booki, booksubjectnaturalhistory
