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Note on the Fossil Fauna and Flora in Tufa at Ongongo Springs, Damara- Land, Namibia

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Note on the Fossil Fauna and Flora in Tufa at Ongongo Springs, Damara- Land, Namibia See discussions, stats, and author profiles for this publication at: https://www.researchgate.net/publication/330312237 Note on the fossil fauna and flora in tufa at Ongongo Springs, Damaraland, Namibia Article in Communications - Geological Survey of Namibia · January 2019 CITATIONS READS 0 11 1 author: Helke Mocke Ministry of Mines and Energy 14 PUBLICATIONS 43 CITATIONS SEE PROFILE Some of the authors of this publication are also working on these related projects: Tsumeb minerals View project All content following this page was uploaded by Helke Mocke on 11 January 2019. The user has requested enhancement of the downloaded file. Communs geol. Surv. Namibia, 15 (2013), 134-141 Note on the fossil fauna and flora in tufa at Ongongo Springs, Damara- land, Namibia H. Mocke Geological Survey of Namibia, National Earth Science Museum, 1 Aviation Road, Private Bag 13297, Windhoek e-mail: [email protected] Knowledge of Quaternary fossils in Namibia is poor, although several sites were identified by Hermann Korn and Henno Martin (Korn and Martin, 1937). The Ongongo Springs in Western Na- mibia are associated with thick layers of tufa (freshwater carbonate) containing a rich collection of impressions of macroscopic fossil plant leaves, roots, branches and trunks. The leaf impressions show mostly primary venation, making their identification difficult. The absence of organic material within the preserved leaves, roots, stems and trunks renders C14 dating impossible. Dating of tufas has been attempted in the past, but the results are not reliable as contaminations easily occur, due to their porous nature. At Ongongo a possible sedge leaf was noted as were impressions of the leaves of sycamore fig, Ficus sycomorus (Family Moraceae) and mopane, Colophospermum mopane (Family Fabaceae). However, no fruits or seeds were found. To date only a single vertebrate fossil has been reported by a visitor to the springs. It was suggested to be the impression of a frog skeleton. Land snails were observed in the tufas and surrounding calcretes and are comparable to the modern genus Sculptaria . Introduction tufa there are constant additions from the surrounding environment and hence much Ongongo Springs is located at S 19˚ contamination, making dating unreliable. 08 ΄25.3 ΄΄ E 13˚ 49 ΄09.5 ΄΄ ca. 30 km south of Dating has been attempted on tufa deposits the village of Sesfontein in Damaraland and in the Namib Naukluft without success (pers. close to another spring and small community comm. Dr A Stone). The tufa may be Qua- settlement called Warmquelle ( German: Hot ternary in age, since the leaf impressions Spring ), which is located about 45 km south identified in the tufa are those of still resi- of the Ongongo Springs camp. dent plant species in the area, like the syca- It is currently run as a communal camp more fig, Ficus sycomorus (Family site by the local inhabitants, and has become Moraceae) and mopane, Colophospermum an attractive tourist destination. mopane (Family Fabaceae). Travertine is the most common spring In Namibia there are several sites pre- deposit, with tufa being a porous variety of serving tufa (Fig. 2), but our knowledge travertine. Both consist of CaCO 3 and tend to about them and the fossils they preserve is have a creamy to off-white colour. Such poor. Hermann Korn and Henno Martin spring deposits form by the precipitation of (1937, 1955) recorded several sites in Na- mineral matter dissolved in waters of hot or mibia, including a 5m-high hill of fossil tufa cold springs which emerge from permeable on Farm Doornkom 173, 65km SSE of Otji- rocks or from weak zones in the earth’s warongo, with casts of reeds. They reported crust, such as faults, fissures and fractures. a similar deposit on Farm Sukses 133 West At the Ongongo site the predominant com- of Maltahöhe. Tufa from Farm Blässkranz, ponent of the spring deposit is tufa (Fig. 1). hosted calcified casts of the reed, Phragmites Upon closer inspection of the tufas at australis , as well as other plant varieties. Ongongo, impressions of leaves, casts of Near Outjo, spring waters calcified a honey- twigs and branches, and moulds of molluscs comb, estimated to be 1 million years old and possibly the bone impressions of a frog and at Bushman Hill spring waters petrified could be seen. The organic matter is not pre- filamentous algae, estimated to be 10 000 served however. Due to the porous nature of years old. Miller (2008) reported both ac- 134 Mocke tively forming and fossil tufas at the Nauk- tary valley walls and areas where water luft Mountains, where calcified plant re- seeps occur. Ward named these deposits the mains and fresh-water crabs, Potamonautes Hudaob Tufa Formation. Another tufa de- perlatus , have been found. Ward (1987) re- posit has been noted at Ruacana (pers. corded 17 tufa deposits along the edge of the comm. Dr M Pickford). lower Kuiseb River canyon section, on tribu- Figure 1 : Sketch of Ongongo Springs area showing the location of the tufa Figure 2 : Locations of reported tufa deposits in Namibia (blue asterisks) 135 Note on the fossil fauna and flora in tufa at Ongongo Springs, Damaraland, Geological setting surficial sediments. At the site of the springs huge boulders of tufa are present within a The geology of the Ongongo area consists of narrow river cut through the conglomerates phyllites and conglomerates of the late Neo- of the Warmquelle Member and the grey, proterozoic Sesfontein Formation (Mulden pearly phyllites of the Sesfontein Formation Group, Damara Supergroup) overlain by (Fig. 3). Figure 3: Regional Geology of the Ongongo Springs area Preservation and description of material was layered randomly with no indication of flow direction. Flora Ficus sycomorus (Family Moraceae) Leaf impressions were noted within the Ongongo tufas. Roots, trunks and stems Figure 4: Description of material were infilled with tufa and form the pre- The apex of the leaf was not preserved. dominant component of the preserved mate- The mid rib and lateral veins are conspicu- rial. ous with a deep depression where the petiole Comparison of well-preserved leaf would have inserted into the base of the leaf specimens with extant plant leaves growing blade. The preserved leaf margin is slightly in the area, indicate that the venation charac- lobate. The base of the leaf blade is slightly ters are particularly similar to sycamore fig heart-shaped. The preserved specimen is and mopane trees. However, carbonaceous comparable in dimensions to that of the ex- material was not preserved and all material tant sycamore fig leaf (Fig. 5), and is com- 136 Mocke patible with all the characters mentioned. Figure 4: Impression of leaf resembling wild fig Figure 5: Extant wild fig growing in the Ongongo (scale in cm) area (scale in cm) Colophospermum mopane veins are well preserved and are comparable (Family Fabaceae) to those seen in extant species of mopane (Fig. 7) still growing in the vicinity. Other, Figure 6: Description of material better preserved specimen were noted during Only the central part of a single leaflet, part low light situations but were inaccessible for of a bi-foliate leaf is preserved. The radiating sampling. Figure 6: Impression of part of a leaflet with radiating Figure 7: Extant mopane leaf (scale in cm) veins (scale in cm) 137 Note on the fossil fauna and flora in tufa at Ongongo Springs, Damaraland, ?Sedge (Family Cyperaceae) seeds were found, which would have helped with the definite identification of the species. Sedges, Figure 8: Description of material such as the one illustrated in figure 9, are grow- Part of a sedge leaf was preserved with ing profusely along the run-off of the spring’s clearly visible parallel veins. Unfortunately no area. Figure 8: Impression of sedge leaf with parallel Figure 9: Extant sedge living in river course (scale veins (scale in cm) in cm) Fauna Sculptaria, terrestrial snail Figures 10, 11, 12: Description of material Small impression of snail with flat- tened whorls, about 8 mm in diameter, pre- served in tufa and calcrete, but aperture not preserved, see figure 12. This impression can be ascribed to a terrestrial snail, similar in general morphology to the modern species Sculptaria (Pickford, pers. comm.). More re- cent specimens were observed in finely lami- nated sediments and calcretes in the immedi- ate area surrounding the spring pool as seen Figure 11: View of aperture opening of Sculp- in figures 10 and 11. taria (scale in cm) Figure 10: Dorsal view of modern Snail, Sculptaria in the area (scale in cm) Figure 12: Impression of snail in tufa (scale in cm) 138 Mocke ?Vertebrate ple is the impression of a frog skeleton based on the interpretation of the shapes of the im- Figure 13: Description of material pressions, which are similar to ribs and ver- Impressions of possibly ribs and verte- tebrae, as well as the scale of the material brae preserved within tufa at the edge of the (pers. Comm. Dr M. Pickford). However, spring run-off. The impressions were re- given the complexity of the specimen and ported and photographed by a visitor to the the lack of bone material, this could not be springs. It has been suggested that the sam- confirmed. Figure 13: Impression of a possible frog. Photo taken by Martin Prinsloo Layered Procavia capensis dung Palaeoecology Figure 14: Description of material Well layered Procavia capensis dung According to the vegetation map of was observed within one of the hollows of Giess (1998), the Ongongo area is located the tufa boulders about 4.5 m above the within the Mopane Savanna vegetation type. spring pool. This is well compacted and not As the name suggests the dominant plant too granular in nature, though it would be species of this vegetation type is Colophos- younger in age than the tufa.
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