Brooksella specimens usually range from 1 to 10 cm in diameter, and show wide morphologic variation.The organism basically consists of a cup-shaped structure (in lateral view) with a variable number of radially disposed lobes (Fig. 4 A) extending from a small central area (in top or bottom view).Radial lobes commonly number four to seven (Fig. 2 A, C, E and G-H), but other specimens have ...However, Asterosoma is a stellate burrow with its type ichnospecies Asterosoma radiciforme Otto, 1854 being passively sand filled instead of laminated (Niebuhr and Wilmsen, 2016; Knaust, 2021). ...Bagian bawah secara stratigrafi Formasi Penosogan diendapkan pada lingkungan neritik luar yang dicirikan oleh asosiasi fosil jejak Scolicia, Planolites, Terebellina, Teichichnus, Asterosoma, dan ...Asterosoma ludwigae Schlirf, 2000 is described in two sections of different age and palaeoenvironment in the Jurassic of the Lusitanian Basin. The scarce and low diversity of palaeoichnocoenoses ...The whole sequence is bioturbated in varying intensity and comprises of 19 identifiable ichnospecies (Arenicolites carbonarius, Asterosoma isp., Curvolithus isp., Didymaulichnus lyelli ...Arenocolites isp (b) Asterosoma ludwigae (c) Cochlichnus anguineus (d) Ophiomorpha annulata (e) Ophimorpha nodosa (f) Ophiomorpha rudis (g&h) Palaeodictyon strozii from publication ...2018年4月12日 ... ... Asterosoma). II – Uma natureza abiótica, implicando nos discos como produtos da ascensão de sedimento fluidificado interagindo com o ...January 2007. Sandra Tegtmeier-Last. The purpose of a seismic survey is to produce an image of the subsurface providing an overview of the earth's discontinuities. The aim of seismic processing is ...Download scientific diagram | -Core photographs illustrating characteristic features of the regional shoreface reservoir: A) planar bedding, from well 111/07-03-054-25W3/00; 81F005, at a depth of ...In addition, Nereites, Asterosoma (Figures 5B-C) and small Rosselia specimens also occur. The delta- front deposits present very few trace fossils, most of them representing equilibrium-escape ...Jan 1, 2017 · B and C. Rock with ichnfosiles of the echinoderm Asterosoma isp (Nos. USON-DG-233, USON-DG-234). Límite geográfico actual de los afloramientos cámbricos del Estado de Sonora. Fig. B and C. Rock with ichnfosiles of the echinoderm Asterosoma isp (Nos. USON-DG-233, USON-DG-234). Límite geográfico actual de los afloramientos cámbricos del Estado de Sonora. Fig.Accessory elements are Asterosoma isp. (Fig. 6D) and Palaeophycus tubularis. Bioturbation intensities range from absent to uncommon, BI 0-2, with the degree of biogenic reworking the most intense ...Named by. Van Gundy (1934), [3] Van Gundy (1951), [4] and Maxson (1961) [5] The Neoproterozoic Nankoweap Formation (pronounced Nan' coe weep), is a thin sequence of distinctive red beds that consist of reddish brown and tan sandstones and subordinate siltstones and mudrocks that unconformably overlie basaltic lava flows of the Cardenas Basalt ...Muddy subaqueous clinoforms are a common feature of many modern deltas, particularly those developed in basins with strong waves, tides, or oceanographic currents.Calcareous siltstone beds, which commonly occur interbedded with both the crinoidal grainstone and brachiopod rudstone beds, contain a low-diversity trace-fossil assemblage of dominantly horizontal deposit feeders (Asterosoma and Planolites) as well as scattered crinoid and echinoid skeletal elements, brachiopods (Aulacothyroides sp. and ...Rosselia, Asterosoma, Teichichnus, Thalassinoides, Planolites and Skolithos burrows are all recognized, defining a Cruziana ichnofacies and suggesting a shoreface setting (Belhaj, 2000). The coexistence of Rosselia and Asterosoma in particular defines a lower shoreface setting. The sandstone is often notably porous and is friable in some cases.Pre-EPME is characterized by a high degree of bioturbation (BI = 5), and a diverse trace fossil assemblage (13 ichnotaxa) with abundant Nereites, frequent Planolites and Phycosiphon, and the more ...The Atchafalaya River and its delta deposit are an end-member example of a high-river supply PAD system with a nearshore prodelta on the continuum to an SDC (Walsh and Nittrouer, 2009).The Atchafalaya River is a distributary of the Mississippi River, and receives about 30% of its discharge (Fig. 1).Since filling in the onshore paralic wetland environments (around the early 1950s), the ...Asterosoma - Wikiwand ... Trace fossilThe Asterosoma occurrences above are in situ and have not been transported and re-deposited. Another Asterosoma example from the Panther Tongue sandstone Utah. The trace fossil is found within deltaic shoreface sandstones that contain abundant Scolicia occurrences. Scolicia occurrences and Asterosoma do appear similar at first glance. Asterosoma isp., ?Macanopsis isp., Ophiomorpha nodosa, Ophio- morpha isp., Palaeophycus tubularis, Rhizocorallium isp., ?Rhizoco- rallium isp., ?Taenidium.Glossary of Terms Adhesive meniscate burrow: Back-filled burrow composed of thin ( 1mm) crescent-shaped packages of compacted sediment that do not weather differentially from the matrix that contains them.Frequently abbreviated to AMB. Agrichnia: farming traces. Constructed by animals that grow algae or trap food particles.Happy Geoscience for Everyone Day! Earth Sciences matter to everyone! As residents of this incredible planet, ALL of us are affected by any number of earth systems in our everyday lives, from the lithosphere, atmosphere, hydrosphere, and biosphere. We should all get involved to understand how it all works!burrowed at top of unit (Asterosoma, Ophiomorpha) 12.2 Sandstone, mudstone and coal, discontinuously interbedded; ss are fg and silty, laterally discontinuous; some ss are high-angle cross-bedded; asymmetrical ripples with clay and carbonaceous drapes, commonly located in cross-bedded ssThe uppermost formal member of the Haystack Mountains, the Hatfield Sandstone Member, where it crops out northeast of Rawlins, is a shoreline deposit. A typical suite of well-developed shoreface trace fossils is recognized, the upper units including Ophiomorpha, Asterosoma, Rosselia, and Teichichnus.Abstract. Sedimentological and stratigraphic analysis of outcrops and subsurface data in the Mahakam Delta province, combined with concepts of transgressive sedimentary processes derived from a ...131 FIGURE 2. Track specimens from DNM 481. A, (DINO 43789) Overview of trampled track surface; B, (DINO 43795) Pes-manus set and preceding manus imprint of a trackway showing digits with hooked distal ends indicating rotation of the foot in a soft substrate; C-E, (DINO 43792, 43790, 43794) Tracks showing rounded digits indicting a lack of foot rotation in a firm substrate; F, (DINO 43796 ...The sedimentary character of the flat zone (lower shoreface-equivalent) consists of relatively thick storm deposits, which are moderately bioturbated by mixed Skolithos and Cruziana suites, including Planolites, Palaeophycus, Polykladichnus, Asterosoma, Siphonichnus, Thalassinoides, Ophiomorpha, Skolithos, Conichnus, Lockeia and cryptobioturbation.palaios, 2009, v. 24, p. 717–722 research note doi: 10.2110/palo.2009.p09-040r ordovician vertebrate habitats: a gondwanan perspective neil s. davies* and ivan j. sansomUpper Cretaceous fine-grained rocks (the "Plänermergel") from the Stoowe Mountains are in general strongly bioturbated. The sections studied (180 m thick), located in the southern part of the mountains, are dominated by mudstones, marlstones and siltstones; sandstones, partly unbioturbated, are subordinate.However, Asterosoma is a stellate burrow with its type ichnospecies Asterosoma radiciforme Otto, 1854 being passively sand filled instead of laminated (Niebuhr and Wilmsen, 2016; Knaust, 2021). ...The ichnospecies Asterosoma ludwigae n. isp., Teichichnus patens n. isp., and Treptichnus aequalternus n. isp. are introduced newly. The ichnogenera Ophiomorpha LUNDGREN, 1891, Thalassinoides ...2010). Patel et al. (2013) have reported Asterosoma ludwigae from the siliciclastic sediments of Kachchh basin. This has also been reported from sandy horizons of Talchir FormationAsterosoma (white arrows) in sandy rock layers interlaminated with thin shale and mudstone. In outcrop, the radiating pattern of this trace is not as obvious as when seen along bedding planes. Species. Asterosoma is a trace fossil, rather than a specific animal or plant fossil. It is given a genera name as a distinctive pattern or trace.Patel et al. (2013) have reported Asterosoma ludwigae from the siliciclastic sediments of Kachchh basin. This has also been reported from sandy horizons of Talchir Formation by Sarkar et al. ...The most common trace fossil is Asterosoma isp. Bichordites isp. burrows occur about 1-2 cm below the top of this unit in the eastern part of the outcrop. The topmost 10 cm contain abundant spines of the echinoderm Eucidaris tribuloides (Lamarck) and Porites sp. coral fragments.GeoConvention 2019 3 present in the uppermost region of FA3 but in low abundance. Based on the presence of sharp-based muds, high organic content, convolute bedding, massive sands, and low BI of FA3, the interpretedJan 16, 2021 · Asterosoma Bulbous to elliptical burrow chambers that are arranged along a central axial tube, somewhat like seed pods attached to a vine. The burrow chambers contain a radial backfill, called menisci, that form as the organism presses material into the burrow walls, yet tries to maintain an open burrow chamber of constant diameter. The shoreface is a seaward sloping, sandstone depositional wedge, and can be subdivided into a lower, middle, and upper shoreface. The sediment wedge grades basinward into offshore sandy and silty ...Perkembangan penelitian iknologi di Indonesia. October 2016. DOI: 10.5281/zenodo.3992590. Conference: Seminar Nasional Kebumian Ke-9: Peran Penelitian Ilmu Kebumian Dalam Pemberdayaan Masyarakat ...PSProdelta Hyperpycnites: Facies, Processes and Reservoir Significance - Examples from the Lower Cretaceous of Russia* C. Zavala1,2, M. Arcuri1,2, V. H. Goitia Antezana3, L. R. Arnez Espinosa3, M. Di Meglio2, and A. Zorzano2 Search and Discovery Article #51367 (2017)** Posted March 13, 2017 *Adapted from poster presentation given at AAPG/SEG International Conference and Exhibition, Barcelona ...Asterosoma (As) and escape structure (Es) on sandy heterolithic facies. Scale bar in centimetres. Scale bar in centimetres. Characteristic trace fossils from Miocene brackish-water deposits in the ...The ichnogenus Asterosoma isp. is interpreted as the result of reworking of sediments by the decapod crustaceans with the objective of broadening tunnel dimensions to prospect food sources ...Planolites, Skolithos, Chondrites, Asterosoma and Cylindrichnus (Figures 6b,c,d), in descending order of relative abundance, are less common in this facies. ... View in full-text Context 4Jan 1, 2017 · B and C. Rock with ichnfosiles of the echinoderm Asterosoma isp (Nos. USON-DG-233, USON-DG-234). Límite geográfico actual de los afloramientos cámbricos del Estado de Sonora. Fig. Download scientific diagram | Core samples collected from Ben Nevis L-55 well, offshore Newfoundland. A, B) Ophiomorpha-Asterosoma ichnofabric; C, D) Ophiomorpha-Thalassinoides ichnofabric. B, D ...Asterosoma trace fossils. Calcareous fossiliferous conglomerate layers occur throughout the Bloyd Formation. Sandy cross-bedded limestones occur in the lower portion of the formation. They are gray to dark gray on fresh surface but weather reddish or light gray to white and contain abundant Asterosoma (white arrows) in sandy rock layers interlaminated with thin shale and mudstone. In outcrop, the radiating pattern of this trace is not as obvious as when seen along bedding planes. Species. Asterosoma is a trace fossil, rather than a specific animal or plant fossil. It is given a genera name as a distinctive pattern or trace.Other articles where Asterozoa is discussed: echinoderm: Annotated classification: Subphylum Asterozoa Fossil and living forms (Lower Ordovician about 500,000,000 years ago to Recent); radially symmetrical with more or less star-shaped body resulting from growth of arms in 1 plane along 5 divergent axes; central mouth; 5 arms; dorsal tube feet and mouth. The composite Asterosoma-Teichichnus ich-nofabric (bioturbation degree 5) occurs in layers without body fossils and representssuites of the Cruziana ichnofacies. This likely reflects intense ...Muddy subaqueous clinoforms are a common feature of many modern deltas, particularly those developed in basins with strong waves, tides, or oceanographic currents.Jun 30, 2021 · Rhizocorallium and Asterosoma from deeper water turbidite/ open marine environments. According to Knaust (2013) Palaeozoic/Mesozoic Rhizocorallium were restricted to . Here you can peruse fossil specimens from many different Geological time periods. We hand select and guarantee all of our specimens. Please contact us for any questions you might have, or simply give us a call at (847) 866-7374. Items 1 - 12 of 246. Show per page. View as Grid List.The concept of "brackish water" encompasses a wide range of salinities that occupy a continuum between fresh water (< 2‰ salinity) and fully marine waters (35‰ salinity).The preceding paper in this journal (Lewis and Ekdale, 1991) describes the lithofacies and their paleovenvironmental setting this fan delta complex. Common trace fossils include the ichnogenera Anconichnus, Arenicolites, Asterosoma, Cylindrichnus, Diplocraterion, Gordia, Helminthoida, Ophiomorpha, Piscichnus, Planolites and Skolithos.Asterosoma. An excellent Asterosoma occurrence is found in fine-grained sandstone within an ancient delta front of a river-influenced delta lobe (Wall Creek Member, Frontier Formation, Powder River Basin, Wyoming). Note the characteristic sand-filled inner core, the surrounding mud ball and the diagnostic target-like appearance of concentric rings.The Cruziana shelf facies contains Conostichus and Asterosoma in the Spiro Sandstone, and Atoka. Formation of the Arkoma basin. An outer shelf facies is ...Note the clearly de fi ned outline of this specimen in contrast to the one shown in Fig. 3 D. D. Bedding-plane view of Asterosoma isp. (As) with horizontal bulbs.Keywords: Asterosoma ludwigae, palaeoichnocoenoses, forced opportunists vs. equilibrium strategy, Jurassic, Portugal. Resumen En este trabajo se describe la icnoespecie Asterosoma ludwigae Schlirf, 2000, que aparece en dos secciones de distinta edad y pa-leoambiente en el Jurásico de la Cuenca Lusitánica.The Pragian to Middle Emsian strata represent the climax of the diversity of body and trace fossils, recording distinct invertebrate life habits; the Asterosoma and Skolithos ichnoguilds predominate in the southern and northwestern borders, respectively, the last representing proximal settings. The "first decline" in Malvinokaffric ...Asterosoma is distinguished from the ichnogenus Phycodes by its bulbous-shaped burrow terminations. Asterosoma is attributed to decapod crustacean producer; e.g., Altevogt (1968), Häntzschel (1975),Glossary of Terms Adhesive meniscate burrow: Back-filled burrow composed of thin ( 1mm) crescent-shaped packages of compacted sediment that do not weather differentially from the matrix that contains them.Frequently abbreviated to AMB. Agrichnia: farming traces. Constructed by animals that grow algae or trap food particles.Polygonal cracking in sandstone, Arkansas River Valley Many of the sandstone formations in Arkansas develop a distinct weathered surface like the picture above. This pattern consists of polygonal plates that die out within a few centimeters depth and is a form of tessellation or commonly called 'elephant skin weathering'. The plates may be flat or…Atoka Formation. Age: Pennsylvanian Period, Atokan Series. Distribution: In the Boston Mountains, Arkansas River Valley, and Ouachita Mountains of Arkansas; eastern Oklahoma, eastern New Mexico, and central and western Texas. Geology: The Atoka Formation is a sequence of marine, mostly tan to gray, silty sandstones and grayish-black shales.Download scientific diagram | Stratigraphic Column for Ordovician Bighorn Group in southeastern Saskatchewan (after Haidl et al., 1987). from publication: Burrow Fabrics in the Ordovician Yeoman ...<< Go Back . Dr. Jacob Grosskopf Assistant Professor. Physical Sciences McEver Bldg 5 1701 N Boulder Ave Russellville, AR 72801 Phone: (479) 968-0661 E-mail: [email protected] ... Asterosoma is an ichnogenus of trace fossil. See also. Ichnology; References External links. Chuck D. Howell's Ichnogenera Photos; This page was last edited on 27 May 2023, at 19:21 (UTC). Text is available under the Creative Commons Attribution-ShareAlike License 4.0; additional terms may apply. By using ...The FA1 packages are generally hosting a proximal variety of the Cruziana ichnofacies (cf. MacEachern et al. 2007a), dominated by either Asterosoma or undefined scrambled ichnofabric overprinted ...In the wetland Niger Delta, the Niger River, the world's seventh longest river (4120-km long), bifurcates into the Nun and Forcados Rivers whose distributary pattern is actually responsible for the origin of the reticulate drainage pattern that characterizes the Niger Delta proper (Fig. 2.2).The drainage density is very high and has given rise to an intricate drainage texture.Calcareous siltstone beds, which commonly occur interbedded with both the crinoidal grainstone and brachiopod rudstone beds, contain a low-diversity trace-fossil assemblage of dominantly horizontal deposit feeders (Asterosoma and Planolites) as well as scattered crinoid and echinoid skeletal elements, brachiopods (Aulacothyroides sp. and ...Asterosoma, Thalassinoides). The ichnologic record, largely predominated by various endichnial burrows, closely approaches the trace fossil record in the fine- ...Mar 1, 2004 · Interbedded sandstones and mudstones contain Teichichnus, Planolites, Terebellina, Arenicolites, Bergaueria, Rosselia, Asterosoma, Cylindrichnus, Thalassinoides, and fugichnia. Burrowed incised valley conglomerates and pebbly sandstones mainly record channel fills of tidal inlets or flood-tidal deltas at wave-dominated estuary mouths. An ichnofabric dominated by Asterosoma, locally accompanied by Teichichnus, Thalassinoides and plug-shaped equilibrium structures (cf. Bromley and Uchman 2003), characterizes the top parts of the thick sandstone beds of lithofacies Sp, Shs and Sr, subsequently covered with the mudshales of lithofacies M (Fig. 9B, D, F). Bedding surfaces in the ...Trace fossils are represented chiefly by the Phycosiphon ichnoguild in the Eifelian–Givetian boundary in the southern edge, and Planolites, Asterosoma, and Skolithos ichnoguilds in the upper strata.Asterosoma. An excellent Asterosoma occurrence is found in fine-grained sandstone within an ancient delta front of a river-influenced delta lobe (Wall Creek Member, Frontier Formation, Powder River Basin, Wyoming). …Asterosoma (white arrows) in sandy rock layers interlaminated with thin shale and mudstone. In outcrop, the radiating pattern of this trace is not as obvious as when seen along bedding planes. Species. Asterosoma is a trace fossil, rather than a specific animal or plant fossil. It is given a genera name as a distinctive pattern or trace.Calcareous siltstone beds, which commonly occur interbedded with both the crinoidal grainstone and brachiopod rudstone beds, contain a low-diversity trace-fossil assemblage of dominantly horizontal deposit feeders (Asterosoma and Planolites) as well as scattered crinoid and echinoid skeletal elements, brachiopods (Aulacothyroides sp. and ...Here you can peruse fossil specimens from many different Geological time periods. We hand select and guarantee all of our specimens. Please contact us for any questions you might have, or simply give us a call at (847) 866-7374. Items 1 - 12 of 242. Show per page. The intervening bioclastic, fine-grained sandstone facies (FA3a) is highly bioturbated by open-marine ichnofossils Ophiomorpha, Asterosoma, and Thalassinoides, indicating deposition during episodic events. The open-marine conditions are evidenced by the prevalence of an ichnofacies assemblage including Ophiomorpha, Asterosoma, and Thalassinoides.Jan 1, 2001 · Asterosoma ludwigae Schlirf, 2000 is described in two sections of different age and palaeoenvironment in the Jurassic of the Lusitanian Basin. The scarce and low diversity of palaeoichnocoenoses ... Trace fossils present within the interval, listed from most abundant to least abundant, include Phycosiphon, Rosselia, Cylindrichnus, Teichichnus, Asterosoma ...Asterosoma from the Pennsylvanian lower tidal at/tidal delta . deposits. Asterosoma has also been reported from shoreface . to offshore deposits (Frey and Howard, 1970; V ossler and .
More recent neoichnological studies have shown how different holothurian taxa are able to excavate burrows comparable to the ichnogenera Arenicolites, Artichnus, Asterosoma, Diplocraterion, Skolithos or Thalassinoides, as well as surficial mounds and funnel-shaped structures (Dashtgard and Gingras, Reference Dashtgard and Gingras …. Diy acorn picker upper
... Asterosoma). Google Scholar. Jensen S (1997) Trace fossils from the Lower Cambrian ... Geologica et Palaeontologica 34:145–213 (Description of Asterosoma ludwigae).One of the most fossiliferous formations in the state is the Pitkin Limestone. It was referred to as the Archimedes Limestone in the late 1890s because it contains an abundance of the screw-shaped bryozoan fossil Archimedes. It was formally named the Pitkin Limestone in 1904 for exposures near Pitkin Post Office in Washington County, Arkansas.The trace-fossil association of estuarine deposits is of low diversity containing ichnotaxa indicative of marine influence (e.g. Asterosoma, Teichichnus). In comparison, deltaic deposits display higher ichnodiversity, and are more intensely bioturbated, locally including some ichnotaxa (e.g. Zoophycos ) that suggest the system may have ...Asterosoma occurs in various environments, from paralic to deep marine, but is especially common in shallow-marine, shoreface deposits (Bromley and Uchman, 2003; Rindsberg and Martin, 2003; Knaust ...Age: Asterosoma has been described from strata of the entire Phanerozoic from Early Cambrian (e.g. Desai et al. 2010) to Holocene (e.g. Dashtgard et al. 2008). Reservoir Quality: Asterosoma is a burrow with an active (mud-dominated) fill, which is less favorable for reservoir quality and fluid migration (La Croix et al. 2013; Knaust 2014a).The Asterosoma, simple traces of deposit-feeding organisms, is a fully marine ichnogenera and mainly developed in distal delta front sediments (Gingras et al., 2011). On the other hand, this facies (PF-4) is generally coarser than those formed in prodelta setting and indicate an increasing proximity to river sources ( Ito et al., 1992 ; Coleman ...Download scientific diagram | Core samples collected from Ben Nevis L-55 well, offshore Newfoundland. A, B) Ophiomorpha-Asterosoma ichnofabric; C, D) Ophiomorpha-Thalassinoides ichnofabric. B, D ...Asterosoma. Interpretation: These silty mudstones at the. basal part of Parasequence 5a are interpreted to. be prodelta and distal bay-fill deposits. The. coarsening upward pattern may indicate ...Lower shoreface deposits are heavily bioturbated by Scolicia, Asterosoma, Thalassinoides, Teichichnus, Palaeophycus and other elements of the Cruziana Ichnofacies whereas middle shoreface sandstone beds contain sand-filled burrows of the Skolithos Ichnofacies. Deltaic deposits record coarsening-upward successions with evidence of freshwater ...10-Nov-2009 ... Variations in trace fossil diversities and the introduction of less markedly facies-crossing ichnogenera (e.g., Asterosoma, Phycosiphon, and ...Asterosoma trace conglomerate layers occur throughout the Bloyd Formation. Sandy cross-bedded limestones occur in the lower portion of the formation. They are gray to dark gray on fresh surface but weather reddish or light gray to white and contain abundant fossils such as crinoids, brachiopods, blastoids and occasionally oolites. Download scientific diagram | 11 Ichnogenera produced by worms. ( a ) Asterosoma , scale bar is 5 cm; ( b ) Balanoglossites , scale bar is 5 cm; ( c ) Chondrites , scale bar is 1 cm; ( d ...Common trace fossils in tidal flat sandstones, in descending order of abundance: A) Thalassinoides, B) Chondrites, C) Asterosoma and D) Cylindrichnus. The arrows point to the trace fossils and the ...Presence of a diverse ichnoassemblage (?Asterosoma, Conichnus, Cylindrichnus, Dactyloidites, Macaronichnus, Ophiomorpha, Skolithos, and Thalassinoides; BI = 0-5) is evidence of high-energy …Rosselia, Asterosoma, Teichichnus, Thalassinoides, Planolites and Skolithos burrows are all recognized, defining a Cruziana ichnofacies and suggesting a shoreface setting (Belhaj, 2000). The coexistence of Rosselia and Asterosoma in particular defines a lower shoreface setting. The sandstone is often notably porous and is friable in some cases.In the "flysch" series of the West Crocker Formation (Eocene-Oligocene), Kota Kinabalu, Sabah, trace fossils are fairly common although not ubiquitous.The Middle and Upper Jurassic succession in Saudi Arabia include the Dhruma, Tuwaiq Mountain, Hanifa, Jubaila, Arab and Hith formations (Bramkamp and Steineke, 1952; Steineke and Bramkamp, 1952; Powers, 1962, 1968).These formations carry different names in other Middle East countries that renders regional correlations and palaeoenvironmental interpretations difficult..
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