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Pristerognathus Assemblage Zone
The ''Pristerognathus'' Assemblage Zone is a tetrapod assemblage zone or biozone which correlates to the upper Abrahamskraal Formation and lowermost Teekloof Formation, Adelaide Subgroup of the Beaufort Group, a fossiliferous and geologically important geological Group of the Karoo Supergroup in South Africa. The thickest outcrops, reaching not more than , occur just east of Sutherland through to Beaufort West in the south and Victoria West in the north. Exposures are also found west of Colesberg and south of Graaff-Reinet. The ''Pristerognathus'' Assemblage Zone is the third biozone of the Beaufort Group.Rubidge, B. S. (ed.) 1995b. ''Biostratigraphy of the Beaufort Group (Karoo Supergroup).'' South African Committee of Stratigraphy. ''Biostratigraphic Series 1''. Pretoria, Council for Geoscience. The name of the biozone refers to '' Pristerognathus polyodon'', a medium-sized carnivorous therocephalian therapsid. It is characterized by the presence of this therocephalian spec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Permian
The Permian ( ) is a geologic period and System (stratigraphy), stratigraphic system which spans 47 million years, from the end of the Carboniferous Period million years ago (Mya), to the beginning of the Triassic Period 251.902 Mya. It is the sixth and last period of the Paleozoic Era; the following Triassic Period belongs to the Mesozoic Era. The concept of the Permian was introduced in 1841 by geologist Sir Roderick Murchison, who named it after the Perm Governorate, region of Perm in Russia. The Permian witnessed the diversification of the two groups of amniotes, the synapsids and the Sauropsida, sauropsids (reptiles). The world at the time was dominated by the supercontinent Pangaea, which had formed due to the collision of Euramerica and Gondwana during the Carboniferous. Pangaea was surrounded by the superocean Panthalassa. The Carboniferous rainforest collapse left behind vast regions of desert within the continental interior. Amniotes, which could better cope with these ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stratigraphic Unit
A stratigraphic unit is a volume of rock of identifiable origin and relative age range that is defined by the distinctive and dominant, easily mapped and recognizable petrographic, lithologic or paleontologic features ( facies) that characterize it. Units must be ''mappable'' and ''distinct'' from one another, but the contact need not be particularly distinct. For instance, a unit may be defined by terms such as "when the sandstone component exceeds 75%". Lithostratigraphic units Sequences of sedimentary and volcanic rocks are subdivided on the basis of their shared or associated lithology. Formally identified lithostratigraphic units are structured in a hierarchy of lithostratigraphic rank, higher rank units generally comprising two or more units of lower rank. Going from smaller to larger in rank, the main lithostratigraphic ranks are bed, member, formation, group and supergroup. Formal names of lithostratigraphic units are assigned by geological surveys. Units of form ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dicynodont
Dicynodontia is an extinct clade of anomodonts, an extinct type of non-mammalian therapsid. Dicynodonts were herbivores that typically bore a pair of tusks, hence their name, which means 'two dog tooth'. Members of the group possessed a horny, typically toothless beak, unique amongst all synapsids. Dicynodonts first appeared in Southern Pangaea during the mid-Permian, ca. 270–260 million years ago, and became globally distributed and the dominant herbivorous animals in the Late Permian, ca. 260–252 Mya. They were devastated by the end-Permian Extinction that wiped out most other therapsids ca. 252 Mya. They rebounded during the Triassic but died out towards the end of that period. They were the most successful and diverse of the non-mammalian therapsids, with over 80-90 genera known, varying from rat-sized burrowers to elephant-sized browsers. Characteristics The dicynodont skull is highly specialised, light but strong, with the synapsid temporal openings at the rear o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fossorial
A fossorial animal () is one that is adapted to digging and which lives primarily (but not solely) underground. Examples of fossorial vertebrates are Mole (animal), moles, badgers, naked mole-rats, meerkats, armadillos, wombats, and mole salamanders. Among invertebrates, many molluscs (e.g., clams), insects (e.g., beetles, wasps, bees), and arachnids (e.g. spiders) are fossorial. Prehistoric evidence The physical adaptation of fossoriality is widely accepted as being widespread among many Prehistory, prehistoric Phylum, phyla and Taxon, taxa, such as bacteria and early eukaryotes. Furthermore, fossoriality has evolved independently multiple times, even within a single Family (biology), family. Fossorial animals appeared simultaneously with the colonization of land by arthropods in the late Ordovician period (over 440 million years ago). Other notable early burrowers include ''Eocaecilia'' and possibly ''Dinilysia''. The oldest example of burrowing in synapsids, the lineag ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diictodon
''Diictodon'' (meaning "two weasel teeth") is an extinct genus of pylaecephalid dicynodont that lived during the Late Permian period, approximately 255 million years ago. Fossils have been found in the ''Cistecephalus'' Assemblage Zone of the Madumabisa Mudstone of the Luangwa Basin in Zambia and the ''Tropidostoma'' Assemblage Zone of the Teekloof Formation, ''Tapinocephalus'' Assemblage Zone of the Abrahamskraal Formation, ''Dicynodon'' Assemblage Zone of the Balfour Formation, ''Cistecephalus'' Assemblage Zone of the Middleton or Balfour Formation of South Africa and the Guodikeng Formation of China. Roughly half of all Permian vertebrate specimens found in South Africa are those of ''Diictodon''. This small herbivorous animal was one of the most successful synapsids in the Permian period. Characteristics Appearance ''Diictodon'' had disproportionally large heads that ended in a horny beak. ‘There is a clear distinction between specimens having canine tusks ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Therocephalia
Therocephalia is an extinct clade of therapsids (mammals and their close extinct relatives) from the Permian and Triassic periods. The therocephalians ("beast-heads") are named after their large skulls, which, along with the structure of their teeth, suggest that they were carnivores. Like other non-mammalian synapsids, therocephalians were once described as "mammal-like reptiles". Therocephalia is the group most closely related to the cynodonts, which gave rise to the mammals. Indeed, it had been proposed that therocephalians themselves may have given rise to the cynodonts, and therefore that therocephalians as recognised are paraphyletic in relation to cynodonts and so not a clade. Conventionally, however, Therocephalia is regarded as the sister clade of Cynodontia, together forming the clade Eutheriodontia. The close relationship of Therocephalia to Cynodontia takes evidence in a variety of skeletal features. Most notable is that the skull roof is narrowed between two enlarged ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carnivore
A carnivore , or meat-eater (Latin, ''caro'', genitive ''carnis'', meaning meat or "flesh" and ''vorare'' meaning "to devour"), is an animal or plant Plants are the eukaryotes that form the Kingdom (biology), kingdom Plantae; they are predominantly Photosynthesis, photosynthetic. This means that they obtain their energy from sunlight, using chloroplasts derived from endosymbiosis with c ... whose nutrition and energy requirements are met by eating, consumption of animal tissue (biology), tissues (mainly muscle, adipose tissue, fat and other soft tissues) as food, whether through predation or scavenger, scavenging. Nomenclature Mammal order The technical term for mammals in the order (biology), order Carnivora is ''carnivoran'', and they are so-named because most member species in the group have a carnivorous diet, but the similarity of the name of the order and the name of the diet causes confusion. Many but not all carnivorans are meat eaters; a few, such as the fe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Graaff-Reinet
Graaff-Reinet (; Xhosa: eRhafu) is a town in the Eastern Cape Province of South Africa. It is the oldest town in the province and the fourth oldest town in South Africa, after Cape Town, Stellenbosch, Simon's Town, Paarl and Swellendam. The town was the centre of a short-lived republic in the late 18th century. The town was a starting point for Great Trek groups led by Gerrit Maritz and Piet Retief and furnished large numbers of the Voortrekkers in 1835–1842. Graaff-Reinet is home to more national monuments than any other town or city in South Africa. It is also known for being a flourishing market for agricultural produce, noted for its mohair industry, and sheep and ostrich farming. History Graaff-Reinet was established by the Dutch East India Company in 1786, after Cape Town in 1652, Stellenbosch in 1679, Paarl in 1687 and Swellendam in 1745. The town is named after then-governor of the Cape Colony, Cornelis Jacob van de Graaff, and his wife. The town was originally ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Colesberg
Colesberg is a town with 17,354 inhabitants in the Northern Cape province of South Africa, located on the main N1 road from Cape Town to Johannesburg. In a sheep-farming area spread over half-a-million hectares, greater Colesberg breeds many of the country's top merinos. It is also renowned for producing high-quality racehorses and many stud farms, including one owned by renowned golfer, Gary Player, are nearby. History Founded in 1830 on an abandoned station of the London Missionary Society, and initially named Toverberg after a nearby hill, it was renamed Colesberg after Sir Galbraith Lowry Cole, then Governor of the Cape Colony. The site of the town lay on one of the well-travelled routes used by traders, hunters and explorers to gain access to the interior. Towerberg or Coleskop is a prominent hill near the town and a landmark easily seen from a distance by travellers. Colesberg saw a large number of battles and skirmishes during the second Anglo-Boer War, and t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Victoria West
Victoria West is a town in the central Karoo region of South Africa's Northern Cape province. It is situated on the main N12 route, at an elevation of . It is the seat of the Ubuntu Local Municipality within the Pixley ka Seme District Municipality. History The town was laid out on the bank of the Brakrivier watercourse in 1843, when the Dutch Reformed Church bought the farm Zeekoegat from the estate of J.H. Classens. It was named Victoria in 1844, after Queen Victoria, though amended to Victoria West in 1855 to distinguish it from an Eastern Cape district. In 1859 the town acquired municipal status. Dutch Reformed Church The first services of the Dutch Reformed Church were led by Rev. Colin Fraser of Beaufort West in the “Kerkhuis” on the farm Kapoksfontein. The congregation in Victoria West separated from that in Beaufort West during October 1843 when the first local preacher, Rev. W.E. Krige was ordained. For various practical reasons, they decided not to establish the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Beaufort West
Beaufort West (Afrikaans: ''Beaufort-Wes''; Xhosa: ''eBhobhofolo'') is a town in the Western Cape province in South Africa. It is the largest town in the arid Great Karoo region, and is known as the "Capital of the Karoo". It forms part of the Beaufort West Local Municipality, with 34,085 inhabitants in 2011. It is the centre of an agricultural district based mainly on sheep farming, and is a significant town and logistical support hub on the N1 national road. Next door to Beaufort West is the Karoo National Park. Important Permian fossils have been found in the area to the west of the town. These were initially found by David Baird, son of the local magistrate in 1827. The old Town Hall and the Dutch Reformed Church have been declared national monuments. History Beaufort West was the first town to be established in the central Karoo. The town was founded in 1818 and initially named ''Beaufort'' after Henry Somerset, 5th Duke of Beaufort, who was the father of Lord Charles ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
