The girl discovered a trilobite fossil that scientists believe reaches 475 million years ago and is extraordinary and very rare.
As we reported recently, an old girl stumbled upon a 475-million-year-old fossil of a trilobite empty exoskeleton as it ran along the shores of Douglas Lake in East Tennessee. And their remarkable find has made headlines worldwide, showing that people on the Internet still have a childlike wonder and fascination for such discoveries.
Ryleigh Taylor just thought it was a cool rock when she saw it, but experts who later examined it identified it as a trilobite, an extinct marine arthropod that probably lived in this area when it was underwater. It is very, very seldom, that such an old fossil of a trilobite exoskeleton is so visible, which makes it all the more remarkable that little Ryleigh could find it.
Trilobite fossils are not particularly rare, but these intact exoskeletal specimens are. As trilobites shed growth, their skeletons typically burst in hundreds of pieces, making this intact specimen a coveted possession for scientists. And people around the world responded to the find with the kind of astonishment and wonder you can expect on the internet today.
"There is tens of thousands of similar trilobite fossils found in many places in the US and around the world," Estanislao Deloserrata wrote in the comments in a Newsweek article on the find, which apparently contained the Fund of the exoskeleton, not a trilobite fossil itself, has misunderstood. was what was rare. "Nothing" Rare about it. In fact, you can find similar items across the country. "
" I am confused about what makes this rare? "Added Stacie Meier and also misunderstood the discovery." Trilobites are easy to find anywhere in the world. And there were so many different types. Trilobites are considered the starting fossil for people who want to start in the field. They are not rare at all. In fact, they are so common that people who search for fossils often ignore them.
And then there's Bill Beer, a KnoxNews reader who could barely hide his excitement: "Not news.
The following is an excerpt from Wikipedia on trilobites
Trilobites are a fossilized group of extinct marine arachnomorphic arthropods that make up the Trilobita genus.Trilobites are one of the earliest known groups of arthropods.The first appearance of trilobites in the fossil record defines the base of the early Cambrian atdaban phase (521
By the time trilobites first appeared in the fossil record, they were already highly diversified Geographically scattered, because Trilobite With a large variety and a slightly fossilized exoskeleton, they left behind an extensive fossil record, with about 17,000 known species spanning the Paleozoic. The study of these fossils has made important contributions to biostratigraphy, paleontology, evolutionary biology and plate tectonics. Trilobites are often placed within the arthropod subphylum Schizoramia within the superclass Arachnomorpha (equivalent to the Arachnata), although several alternative taxonomies are found in the literature.
Trilobites had many lifestyles; Some moved over the seabed as predators, scavengers, or filter eaters, and some swam and planked plankton. Most lifestyles that are expected of modern marine arthropods are seen in trilobites, with the possible exception of parasitism (where scientific debate continues). Some trilobites (especially the Olenidae family) even seem to have developed a symbiotic relationship with sulfur-eating bacteria from which they derived food.
Trilobites seem to have been exclusively marine organisms, since the fossil remains of trilobites are always found in rocks with fossils of other saltwater animals such as brachiopods, crinoids and corals. Within the marine Paleo environment, trilobites have been found in a wide range from extremely shallow water to very deep water. Trilobites, such as brachiopods, crinoids and corals, are found on every modern continent, occupying every ancient ocean from which Paleozoic fossils were extracted.  The remains of trilobites can range from the conserved body to pieces of the outer skeleton hidden in the process of ecdysis. In addition, the traces of trilobites living on the seabed are often preserved as trace fossils.
There are three major forms of trace fossils associated with trilobites: Rusophycus; Cruziana & Dipichnites – such trace fossils represent the conserved life activity of trilobites active on the seafloor. Rusophycus, the resting lane, are trilobite excavations with little or no forward movement and ethological interpretations suggest peace, shelter and hunting. Cruziana, the feeding track, are furrows through the sediment, which are believed to represent the movement of trilobites during deposit feeding. It is believed that many of the fossil fossils are traces of trilobites migrating on the sedimentary surface. However, care must be taken to record similar trace fossils in freshwater and post-Paleozoic deposits of non-trilobite origin.
Trilobite fossils are found worldwide, with many thousands of known species. Because they appeared rapidly in geological time and mowed like other arthropods, trilobites serve as excellent index fossils, allowing geologists to determine the age of the rocks in which they are located. They were among the first fossils that attracted wide attention, and each year new species are discovered.
In the United States, the most publicly available collection of trilobites is in Hamburg, New York. Informally known as Penn Dixie, it was discovered by Dan Cooper in the 1970s. The slate quarry stopped mining in the 1960s, but the amount of rock quarrying had large trilobite occurrences. As a well-known rock collector he has aroused the scientific and public interest in this place. The fossils were dated 350 million years ago, when the western New York region was 30 degrees south of the equator and was completely covered in water. The site was acquired by Vincent Bonerb, Cavalcoli, from the City of Hamburg in cooperation with the Hamburg Natural History Society to protect the land from development. In 1994, the quarry became the Penn Dixie Fossil Park & Nature Reserve when it received status 501 (c) 3 and was opened for inspection and collection of trilobite samples. The two most common samples are Phacops rana and Greenops.
A well-known site for trilobite fossils in the UK is Wren's Nest, Dudley in the West Midlands, where Calymene blumebachii occurs in the group of Silur Wenlock. Pictured on the coat of arms, this trilobite was named Dudley Bug or Dudley Locust by stone-cutters who once carved the abandoned limestone quarries. Llandrindod Wells, Powys, Wales, is another famous trilobite location. The well-known Elrathia kingi trilobite is abundant in the American era of Wheeler Shale in Utah.
Spectacularly preserved trilobite fossils, often showing soft body parts (legs, gills, antennae, etc.), were found in British Columbia. Canada (Cambrian Burgess Shale and similar places); New York, USA (Ordovician Walcott-Rust Quarry, near Russia and Beechers Trilobit bed, near Rome); China (Lower Cambrian Maotianshan Shales near Chengjiang); Germany (Devonian Hunsrück Slates near Bundenbach) and, much less often, in trilobite-bearing strata in Utah (Wheeler shale and other formations), Ontario and Manuels River, Newfoundland and Labrador
The French paleontologist Joachim Barrande (1799 (1883 ) performed his groundbreaking study of the trilobites in the Cambrian, Ordovician and Silurian of Bohemia and published the first volume of Système silurien du center de la Bohême in 1852.