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Chelichnus
''Chelichnus'' is an ichnogenus of Permian tetrapod footprint. The name means ''tortoise traces'', because the shape of the prints was originally mistakenly thought to be produced by a tortoise. This is now known to be incorrect, as tortoises did not evolve until much later. It was first found in Corncockle Quarry in Dumfries, Scotland, and described by Rev. Henry Duncan. In ichnology, footprints and other traces are given a genus and species name, the ichnogenus and ichnospecies, that is based on the shape of the print. However, it is almost impossible to match a trackmark to the animal that made it. ''Chelichnus'' has been argued to belong to either a therapsid Therapsida is a major group of eupelycosaurian synapsids that includes mammals, their ancestors and relatives. Many of the traits today seen as unique to mammals had their origin within early therapsids, including limbs that were oriented more ..., or a reptile.McKeever, PJ. 1994. The behavioural and biostratigrap ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
19th Century In Ichnology
The 19th century in ichnology refers to advances made between the years 1800 and 1899 in paleontology, 1899 in the scientific study of trace fossils, the preserved record of the behavior and Physiology, physiological processes of ancient life forms, especially fossil footprints. The 19th century was notably the first century in which fossil footprints received scholarly attention. British paleontologist William Buckland performed the first true scientific research on the subject during the early :1830s in paleontology, 1830s. A slab of Permian-aged sandstone had been discovered in Scotland which preserved a series of unusual footprints. After acquiring the specimen, Buckland experimented with modern animals to ascertain the trackmaker and concluded that the Scottish footprints were made by tortoises. Later in the century famed advocate of evolution Thomas Henry Huxley would refute this attribution and these footprints, called ''Chelichnus'', would remain without an identified trackm ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Corncockle Quarry
Corncockle Quarry was a large and historically important sandstone quarry near Templand in Dumfries and Galloway, Scotland. Stone from here was used in the late Victorian era to build tenements in Edinburgh and Glasgow, and also to construct New York ' brownstones'. Geology The sandstone in Corncockle Quarry is the Corncockle Sandstone Formation and dates from the Cisuralian, the Lower Permian between 298.9 - 272.3 Mya. Fossil footprints were found there in the early 1800s, uncovered during quarrying. They are often wrongly referred to as dinosaur footprints, but dinosaurs did not exist at this time. They belong instead to other extinct reptiles such as therapsids - the group that would eventually lead to mammals, and includes animals like '' Dimetrodon''. The footprints from Corncockle were the first ever described scientifically, by Mr. J Grierson, and the Reverend Henry Duncan in 1828. Rev Duncan then published his paper on the footprints in 1831. The name for the study of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Henry Duncan (minister)
Henry Duncan FRSE (8 October 1774 – 12 February 1846) was a Scottish minister, geologist and social reformer. The minister of Ruthwell in Dumfriesshire, he founded the world's first mutual savings bank that would eventually form part of the Trustee Savings Bank. He served as Moderator of the General Assembly of the Church of Scotland in 1839. At the Disruption has left the Church of Scotland and sided with the Free Church. He was also a publisher, a philanthropist and an author, writing novels as well as works of science and religion. Early life Duncan was born in 1774 at Lochrutton, Kirkcudbrightshire, where his father, George Duncan, was minister. As a boy he met the poet Robert Burns, who visited Lochrutton Manse. Duncan was educated in Dumfries at the Academy. After studying for two sessions at St. Andrews University he was sent to Liverpool to begin commercial life, and under the patronage of his relative, Dr. James Currie, the biographer of Robert Burns, his ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Permian
The Permian ( ) is a geologic period and 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 251.9 Mya. It is the 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 region of Perm in Russia. The Permian witnessed the diversification of the two groups of amniotes, the synapsids and the 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 drier conditions, rose to dominance in place of their am ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ichnogenus
An ichnotaxon (plural ichnotaxa) is "a taxon based on the fossilized work of an organism", i.e. the non-human equivalent of an artifact. ''Ichnotaxa'' comes from the Greek ίχνος, ''ichnos'' meaning ''track'' and ταξις, ''taxis'' meaning ''ordering''.Definition o'ichno'at dictionary.com. Ichnotaxa are names used to identify and distinguish morphologically distinctive ichnofossils, more commonly known as trace fossils. They are assigned genus and species ranks by ichnologists, much like organisms in Linnaean taxonomy. These are known as ichnogenera and ichnospecies, respectively. "Ichnogenus" and "ichnospecies" are commonly abbreviated as "igen." and "isp.". The binomial names of ichnospecies and their genera are to be written in italics. Most researchers classify trace fossils only as far as the ichnogenus rank, based upon trace fossils that resemble each other in morphology but have subtle differences. Some authors have constructed detailed hierarchies up to ichnosupe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tetrapod
Tetrapods (; ) are four-limbed vertebrate animals constituting the superclass Tetrapoda (). It includes extant and extinct amphibians, sauropsids ( reptiles, including dinosaurs and therefore birds) and synapsids (pelycosaurs, extinct therapsids and all extant mammals). Tetrapods evolved from a clade of primitive semiaquatic animals known as the Tetrapodomorpha which, in turn, evolved from ancient lobe-finned fish (sarcopterygians) around 390 million years ago in the Middle Devonian period; their forms were transitional between lobe-finned fishes and true four-limbed tetrapods. Limbed vertebrates (tetrapods in the broad sense of the word) are first known from Middle Devonian trackways, and body fossils became common near the end of the Late Devonian but these were all aquatic. The first crown-tetrapods (last common ancestors of extant tetrapods capable of terrestrial locomotion) appeared by the very early Carboniferous, 350 million years ago. The specific aquatic ancestors ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dumfries
Dumfries ( ; sco, Dumfries; from gd, Dùn Phris ) is a market town and former royal burgh within the Dumfries and Galloway council area of Scotland. It is located near the mouth of the River Nith into the Solway Firth about by road from the Anglo-Scottish border and just away from Cumbria by air. Dumfries is the county town of the historic county of Dumfriesshire. Before becoming King of Scots, Robert the Bruce killed his rival the Red Comyn at Greyfriars Kirk in the town on 10 February 1306. The Young Pretender had his headquarters here during a 3-day sojourn in Dumfries towards the end of 1745. During the Second World War, the bulk of the Norwegian Army during their years in exile in Britain consisted of a brigade in Dumfries. Dumfries is nicknamed ''Queen of the South''. This is also the name of the town's professional football club. People from Dumfries are known colloquially in Scots language as ''Doonhamers''. Toponymy There are a number of theories on the etymo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Therapsid
Therapsida is a major group of eupelycosaurian synapsids that includes mammals, their ancestors and relatives. Many of the traits today seen as unique to mammals had their origin within early therapsids, including limbs that were oriented more underneath the body, as opposed to the sprawling posture of many reptiles and salamanders. Therapsids evolved from "pelycosaurs", specifically within the Sphenacodontia, more than 279.5 million years ago. They replaced the "pelycosaurs" as the dominant large land animals in the Middle Permian through to the Early Triassic. In the aftermath of the Permian–Triassic extinction event, therapsids declined in relative importance to the rapidly diversifying reptiles during the Middle Triassic. The therapsids include the cynodonts, the group that gave rise to mammals ( Mammaliaformes) in the Late Triassic, around 225 million years ago. Of the non-mammalian therapsids, only cynodonts survived beyond the end of the Triassic, with the only other ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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