| 词条 | Mazon Creek fossil beds |
| 释义 |
| period = Moscovian | age = ~{{fossil range|309|307|refs=[1]}} }}{{Infobox NRHP | name =Mazon Creek Fossil Beds | nrhp_type =nhl | image = | caption = | nearest_city= Benson Road, Morris, Illinois | locmapin = Illinois#USA | area = | designated_nrhp_type= September 25, 1997[2] | added = September 25, 1997[3] | governing_body = Private | refnum=97001272 }} The Mazon Creek fossil beds are a conservation {{lang|de|lagerstätte}} found near Morris, in Grundy County, Illinois. The fossils are preserved in ironstone concretions, formed approximately {{Ma|309}} in the mid-Pennsylvanian epoch of the Carboniferous period. These concretions frequently preserve both hard and soft tissues of animal and plant materials, as well as many soft-bodied organisms that do not normally fossilize. The quality, quantity and diversity of fossils in the area, known since the mid-nineteenth century, make the Mazon Creek {{lang|de|lagerstätte}} important to paleontologists, in attempting to reconstruct the paleoecology of the sites.[4] The locality was declared a National Historic Landmark in 1997.[2][5] GeologyThe Mazon Creek fossils are found in the Upper Carboniferous Francis Creek Shale;[6] the type locality is the Mazon River (or Mazon Creek), a tributary of the Illinois River near Morris, Grundy County, Illinois. The 25 to 30 meters of shale were formed approximately {{Ma|309}}, during the Pennsylvanian period. The fossiliferous concretions are usually found within the thickest deposits of Francis Creek. The concretions occur in localized deposits within the silty to sandy mudstones, in the lower four metres of the formation. The paleoecosystem is believed to be a large river delta system, deposited by at least one major river system flowing from the northeast. The sediments are believed to derive from the Appalachian orogeny events. The delta had a tropical climate, a result of the area being within 10° north latitude of the equator during the Pennsylvanian. The remains of plants and animals were rapidly buried by the sediment deposited in the deltaic system. Bacterial decomposition of the remains produced carbon dioxide that combined with dissolved iron from the groundwater. This process formed siderite in the sediments surrounding the remains, forming detailed casts of their structure. Lithification of the sediments formed protective nodules of ironstone around the now fossilized remains. This mode of preservation is known as authigenic mineralisation. LocationThe fossiliferous concretions are found in the Mazon River area of Grundy, Will, Kankakee, and Livingston counties. Additional fossils are found in LaSalle County, Illinois; between the Vermilion River and Marseilles, Illinois. The ironstone concretions are recovered from exposures along streams, roadcuts and in active or abandoned coal mine areas. While professional geologists commonly mispronounced it MAY-zon, the correct local pronunciation is Muh-ZOHN. ({{IPAc-en|m|ə|ˈ|z|ɒ|n}}){{citation needed|date=January 2019}} Most concretions are found among the shale and sandstone that was piled up in either a spoil tip of an older underground mine, or ridges of the later surface mining. The Peabody Energy company operated several large strip mines in Grundy County that are now abandoned. They were named Pit 1 through Pit 11. The northern pits 1-8 are known for the Braidwood Biota with mostly terrestrial fauna and flora. Pit 11, which was located southwest of the town of Braidwood, Illinois, is known for its Essex Biota with a greater abundance of marine species.[7] Pit 11 is now Braidwood State Fish and Wildlife Area, an Illinois state park. Fossil collecting is allowed at the park with a permit.[8] The site's importance was realized in the mid-nineteenth century: "the nodules of Mazon Creek, where fragments of plants, even of the softest texture, have been preserved in their integrity".[9] FloraThe Mazon Creek flora comprises over 400 species from at least 130 genera. However, the true number of species is difficult to determine. Paleobotanists name separate plant structures with different names by convention, inflating the number of fossil plant taxa. Paleobotanists are currently determining which taxa are valid. Mazon Creek flora includes: lycopsids, related to modern club moss, with arborescent forms named Lepidophloios, Sigillaria and Lepidodendron, and herbaceous forms called Lycopodites and Cormophyton; sphenopsids like Calamites a tree-like horsetail relative, with common foliage names of Annularia and Asterophyllites, and a vine-like form called Sphenophyllum; Pteridophyta as marattitalean tree ferns and Filicales and Zygopteridales understory ferns, with common foliage names of Pecopteris, Acitheca and Lobatopteris; pteridosperms, also known as seed ferns, an extinct group of plants that grew both as trees and smaller shrubs, with features like pinnated leaves similar to true ferns, but reproduced by seeds instead of spores; they had common foliage names Mariopteris, Alethopteris, Odontopteris, Neuropteris, Laveineopteris and Macroneuropteris; extinct gymnosperm Cordaites, believed to be closely related to and sharing many features with modern conifers. FaunaThe Mazon Creek fauna has over 320 species of animals that have been identified. The fauna is divided into two components: the marine Essex fauna and the land and freshwater Braidwood fauna, that were washed into the deltaic sediments. Essex biotaThe Essex fauna includes jellyfish, sea worms, snails, saltwater clams, shrimp, sea scorpions, cephalopods[6] and fish. The most common species found is the Essexella jellyfish. It consists of 42% of all fossil finds in the Essex biota.[7] The Essex area also includes the most famous faunal member of the Illinois' state fossil Tullimonstrum, known popularly as the "Tully Monster". Other well-documented organisms include the crustacean Belotelson and the possible hemichordate Etacystis. Braidwood biotaThe Braidwood fauna includes insects, millipedes, centipedes, scorpions, spiders, other arachnids, amphibians, freshwater fish, freshwater shrimps, freshwater horseshoe crabs and ostracods. The oldest known beetle has been described from the Braidwood fauna.[10] Three species of centipede have been described from Mazon Creek. They are known from around 60 specimens in total, and belong to three species:[11]
Fossil centipedes are very rare, and Mazoscolopendra and Palenarthrus are the only known Paleozoic scolopendromorphs.[12] See also{{Portal|Palaeontology|Illinois}}
References1. ^McCoy VE, Asael D, Planavsky N. Benthic iron cycling in a high-oxygen environment: Implications for interpreting the Archean sedimentary iron isotope record. Geobiology. 2017;15:619–627. https://doi.org/10.1111/gbi.12247 2. ^1 {{cite web|url=http://tps.cr.nps.gov/nhl/detail.cfm?ResourceId=-1975645062&ResourceType=Site|title=Mazon Creek Fossil Beds|accessdate=2007-10-11|work=National Historic Landmark summary listing|publisher=National Park Service|deadurl=yes|archiveurl=https://web.archive.org/web/20080103060206/http://tps.cr.nps.gov/nhl/detail.cfm?ResourceId=-1975645062&ResourceType=Site|archivedate=2008-01-03|df=}} 3. ^{{NRISref|2007a}} 4. ^Illinois State Museum-Mazon Creek Fossil Exhibit 5. ^{{citation|title=National Historic Landmark Nomination: Mazon Creek Fossil Beds |url={{NHLS url|id=97001272}} |format=pdf|date=March 30, 1995 |author=Joanne Klussendorf |publisher=National Park Service}}. {{NHLS url|id=97001272|title=Accompanying photos, from 1912 and 1991.|photos=y}} {{small|(497 KB)}} 6. ^1 {{cite journal |author=P. A. Allison |year=1987 |title=A new cephalopod with soft parts from the Upper Carboniferous Francis Creek Shale of Illinois, USA |journal=Lethaia |volume=20 |issue=78 |pages=117–121 |doi=10.1111/j.1502-3931.1987.tb02028.x}} 7. ^1 {{cite book | first1=Paul | last1=Selden | url=https://books.google.com/books?id=LgdL9ZP2ftgC&pg=PA94 | title=Evolution of Fossil Ecosystems | publisher=Manson Publishing Ltd | last2=Nudds | first2=John | year=2012 | edition=second | pages=94–96 | isbn=978-1-84076-623-3 | chapter=Mazon Creek}} 8. ^http://dnr.state.il.us/Lands/Landmgt/PARKS/R2/MAZONIA.HTM#Fossil {{webarchive|url=https://web.archive.org/web/20070605232303/http://dnr.state.il.us/lands/landmgt/PARKS/R2/MAZONIA.HTM |date=2007-06-05 }} 9. ^A.H.W. in Geological Survey of Illinois, 1866, p 489 10. ^{{cite journal |author=Oliver Bethoux |year=2009 |title=The earliest beetle identified |journal=Journal of Paleontology |volume=83 |issue=6 |pages=931–937 |doi=10.1666/08-158.1}} 11. ^{{cite book |editor=Alessandro Minelli |year=1990 |title=Proceedings of the 7th International Congress of Myriapodology |publisher=Brill Publishers |isbn=978-90-04-08972-3 |author1=William A. Shear |author2=Patricia M. Bonamo |lastauthoramp=yes |chapter=Fossil centipeds from the Devonian of New York State, U.S.A. |pages=89–96 |url=https://books.google.co.uk/books?id=BJzFnCunVxsC&pg=PA89}} 12. ^{{cite journal |author=Heather M. Wilson |year=2003 |title=A new scolopendromorph centipede (Myriapoda: Chilopoda) from the Lower Cretaceous (Aptian) of Brazil |journal=Journal of Paleontology |volume=77 |issue=1 |pages=73–77 |jstor=4094718 |doi=10.1666/0022-3360(2003)077<0073:ANSCMC>2.0.CO;2}} Further reading
External links{{commons category|Mazon Creek fossil beds}}
12 : Carboniferous paleontological sites|Lagerstätten|Paleozoic paleontological sites of North America|Geography of Grundy County, Illinois|Carboniferous Illinois|Natural history of Illinois|Paleontology in Illinois|National Historic Landmarks in Illinois|Natural features on the National Register of Historic Places|National Register of Historic Places in Grundy County, Illinois|Protected areas of Grundy County, Illinois|1997 in paleontology |
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