Kromdraai fossil site

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Kromdraai fossil site
South Africa Gauteng relief location map.svg
Red pog.svg
Location in Gauteng
Location Gauteng, South Africa
Nearest cityKrugersdorp, South Africa
Coordinates 26°00′00″S27°45′00″E / 26.00000°S 27.75000°E / -26.00000; 27.75000
EstablishedIncorporated into the Cradle of Humankind 1999
Governing bodyCradle of Humankind and Private Landowner

Kromdraai (Afrikaans for "crooked turn") is a fossil-bearing breccia-filled cave located about 2 kilometres (1.2 mi) east of the well-known South African hominid-bearing site of Sterkfontein and about 45 kilometres (28 mi) northwest of Johannesburg, South Africa. It is situated within the Cradle of Humankind World Heritage Site and is itself a South African National Heritage Site. [1]

Contents

History of investigations

Kromdraai A viewed from the Southwest in 2007 Kromdraai A.jpg
Kromdraai A viewed from the Southwest in 2007
Kromdraai B viewed from the Northeast in 2007 Kromdraai B.jpg
Kromdraai B viewed from the Northeast in 2007

In 1938, the site was brought to the attention of Robert Broom by a local schoolboy named Gert Terrblanche who had discovered several hominin teeth. The teeth formed part of a skull that would become the holotype of Paranthropus robustus . Broom began excavations at the site that would continue until approximately 1947 and would result in the discovery of numerous hominin remains. Two deposits were noted and named at the site  — Kromdraai A (KA) and Kromdraai B (KB) — the latter being the site where the hominin remains were recovered. [2]

In 1955 C.K. Brain recommenced work at Kromdraai B and discovered numerous additional hominin remains as well as abundant non-hominin fauna. [3]

In the 1980s Elizabeth Vrba briefly conducted excavations at Kromdraai B in order to recover additional samples for her work on South African bovids. [4]

In 1993 excavations were re-opened by Francis Thackeray of the Transvaal Museum and Lee Berger of the University of the Witwatersrand and are currently ongoing. Thackeray and Berger were later joined by teams from Harvard University and other collaborators. [5] Important results of this work have been the recovery of additional hominin fossils as well as the obtaining of more accurate dates for the site.

Recovered fossils

Besides the holotype specimen of P. robustus, at the time of the writing of this article 29 hominin specimens had been recovered from Kromdraai B. [3] Many thousands of animal fossils have also been recovered from both Kromdraai A and B. By 2014, the Kromdraai B fossil assemblages totaled 6,067 specimens. [6]

Age of the deposits

Kromdraai B is dated to between approximately 2.0 - 1.6 Ma with the majority if not all the Paranthropus robustus fossils dating to between 1.8 and 1.6 Ma. [7]

Geology

Kromdraai is a roofless dolomite cave on the southern side of Blaauwbank stream. Kromdraai is contained within the Cradle of Humankind and is approximately 2 kilometres (1.2 mi) east of the Sterkfontein fossil site. It consists of two fossil-bearing localities, Kromdraai A (KA) and Kromdraai B (KB). KA is located 30 metres (98 ft) to the south of KB. KB is the main fossil deposit at the Kromdraai site. The boundaries of both localities are lined by dolomite. [6]

See also

Related Research Articles

<i>Paranthropus</i> Contested extinct genus of hominins

Paranthropus is a genus of extinct hominin which contains two widely accepted species: P. robustus and P. boisei. However, the validity of Paranthropus is contested, and it is sometimes considered to be synonymous with Australopithecus. They are also referred to as the robust australopithecines. They lived between approximately 2.9 and 1.2 million years ago (mya) from the end of the Pliocene to the Middle Pleistocene.

<span class="mw-page-title-main">Robert Broom</span> South African doctor and palaeontologist (1866–1951)

Robert Broom FRS FRSE was a British- South African medical doctor and palaeontologist. He qualified as a medical practitioner in 1895 and received his DSc in 1905 from the University of Glasgow.

<span class="mw-page-title-main">Cradle of Humankind</span> Paleoanthropological site near Johannesburg, South Africa

The Cradle of Humankind is a paleoanthropological site that is located about 50 km (31 mi) northwest of Johannesburg, South Africa, in the Gauteng province. Declared a World Heritage Site by UNESCO in 1999, the site is home to the largest known concentration of human ancestral remains anywhere in the world. The site currently occupies 47,000 hectares (180 sq mi) and contains a complex system of limestone caves. The registered name of the site in the list of World Heritage Sites is Fossil Hominid Sites of South Africa.

<span class="mw-page-title-main">Sterkfontein</span> Archaeological site in Gauteng, South Africa

Sterkfontein is a set of limestone caves of special interest in paleoanthropology located in Gauteng province, about 40 kilometres (25 mi) northwest of Johannesburg, South Africa in the Muldersdrift area close to the town of Krugersdorp. The archaeological sites of Swartkrans and Kromdraai are in the same area. Sterkfontein is a South African National Heritage Site and was also declared a World Heritage Site in 2000. The area in which it is situated is known as the Cradle of Humankind. The Sterkfontein Caves are also home to numerous wild African species including Belonogaster petiolata, a wasp species of which there is a large nesting presence.

<span class="mw-page-title-main">Mrs. Ples</span> Hominin fossil

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Australopithecus africanus is an extinct species of australopithecine which lived between about 3.3 and 2.1 million years ago in the Late Pliocene to Early Pleistocene of South Africa. The species has been recovered from Taung, Sterkfontein, Makapansgat, and Gladysvale. The first specimen, the Taung child, was described by anatomist Raymond Dart in 1924, and was the first early hominin found. However, its closer relations to humans than to other apes would not become widely accepted until the middle of the century because most had believed humans evolved outside of Africa. It is unclear how A. africanus relates to other hominins, being variously placed as ancestral to Homo and Paranthropus, to just Paranthropus, or to just P. robustus. The specimen "Little Foot" is the most completely preserved early hominin, with 90% of the skeleton intact, and the oldest South African australopith. However, it is controversially suggested that it and similar specimens be split off into "A. prometheus".

<i>Paranthropus robustus</i> Extinct species of hominin of South Africa

Paranthropus robustus is a species of robust australopithecine from the Early and possibly Middle Pleistocene of the Cradle of Humankind, South Africa, about 2.27 to 0.87 million years ago. It has been identified in Kromdraai, Swartkrans, Sterkfontein, Gondolin, Cooper's, and Drimolen Caves. Discovered in 1938, it was among the first early hominins described, and became the type species for the genus Paranthropus. However, it has been argued by some that Paranthropus is an invalid grouping and synonymous with Australopithecus, so the species is also often classified as Australopithecus robustus.

<i>Paranthropus boisei</i> Extinct species of hominin of East Africa

Paranthropus boisei is a species of australopithecine from the Early Pleistocene of East Africa about 2.5 to 1.15 million years ago. The holotype specimen, OH 5, was discovered by palaeoanthropologist Mary Leakey in 1959 at Olduvai Gorge, Tanzania and described by her husband Louis a month later. It was originally placed into its own genus as "Zinjanthropus boisei", but is now relegated to Paranthropus along with other robust australopithecines. However, it is also argued that Paranthropus is an invalid grouping and synonymous with Australopithecus, so the species is also often classified as Australopithecus boisei.

<span class="mw-page-title-main">Swartkrans</span> Fossil-bearing cave in South Africa

Swartkrans is a fossil-bearing cave designated as a South African National Heritage Site, located about 32 km (20 mi) from Johannesburg. It is located in the Cradle of Humankind World Heritage Site and is notable for being extremely rich in archaeological material, particularly hominin remains. Fossils discovered in the limestone of Swartkrans include Homo ergaster, Paranthropus and Homo habilis. The oldest deposits present at the site are believed to be between 1.9 and 2.1 million years old.

<span class="mw-page-title-main">Evolutionary Studies Institute</span> Research institute in South Africa

The Evolutionary Studies Institute (ESI) is a paleontological, paleoanthropological and archeological research institute operated through the Faculty of Science of the University of the Witwatersrand, Johannesburg, South Africa. Previously known as the Bernard Price Institute for Palaeontological Research (BPI) it was renamed the Evolutionary Studies Institute in 2013 to better showcase the scope of its research.

Cooper's Cave is a series of fossil-bearing breccia filled cavities. The cave is located almost exactly between the well known South African hominid-bearing sites of Sterkfontein and Kromdraai and about 40 kilometres (25 mi) northwest of Johannesburg, South Africa and has been declared a South African National Heritage Site.

Gladysvale Cave is a fossil-bearing breccia filled cave located about 13 kilometres (8.1 mi) northeast of the well-known South African hominid-bearing sites of Sterkfontein and Swartkrans and about 45 kilometres (28 mi) north-northwest of Johannesburg, South Africa. It is situated within the Cradle of Humankind World Heritage Site and is itself a South African National Heritage Site.

Motsetsi Cave is a fossil-bearing breccia filled cavity located about 14 kilometres (8.7 mi) east of the well known South African hominid-bearing sites of Sterkfontein and Kromdraai and about 45 kilometres (28 mi) north-northwest of Johannesburg, South Africa. Motsetsi has been declared a South African National Heritage Site.

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References

  1. "9/2/233/0022-001 - Kromdraai Palaeontological Reserve, Kromdraai 71, Krugersdorp District". South African Heritage Resources Agency. Archived from the original on 15 April 2014. Retrieved 16 September 2013.
  2. Broom, Robert (1951). Finding the Missing Link: An Account of Recent Discoveries Throwing New Light on the Origin of Man. London: C. A. Watts.
  3. 1 2 Thackeray, J.F.; de Ruiter, D.J.; Berger, L.R.; van der Merve, N.J. (2001). "Hominid fossils from Kromdraai: a revised list of specimens discovered since 1938". Annals of the Transvaal Museum. 38 (4): 43–56.
  4. Vrba, E. (1981). "The Kromdraai Australopithecine site revisited in 1980: recent investigations and results". Annals of the Transvaal Museum. 33 (3): 17–60. hdl:10520/AJA00411752_1037.
  5. Berger, L.R.; Menter, C.; Thackeray, F. (1994). "The renewal of excavation activities at Kromdraai, South Africa". South African Journal of Science. 90 (4): 209–210.
  6. 1 2 Braga, José; Thackeray, John Francis; Bruxelles, Laurent; Dumoncel, Jean; Fourvel, Jean-Baptiste (January 2017). "Stretching the time span of hominin evolution at Kromdraai (Gauteng, South Africa): Recent discoveries". Comptes Rendus Palevol. 16 (1): 58–70. Bibcode:2017CRPal..16...58B. doi: 10.1016/j.crpv.2016.03.003 .
  7. Herries, Andy I.R.; Hopley, Philip J.; Adams, Justin W.; Curnoe, Darren; Maslin, Mark A. (2010). "Letter to the editor: Geochronology and palaeoenvironments of Southern African hominin-bearing localities-A reply to Wrangham et al., 2009. "Shallow-water habitats as sources of fallback foods for hominins"". American Journal of Physical Anthropology. 143 (4): 640–646. doi:10.1002/ajpa.21389. ISSN   0002-9483. PMID   20872806.