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Showing results for tags 'Devonian'.
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From the album: Old Port Formation
Extremely rare trilobite from the Old Port formation of Pennsylvania. -
From the album: Mahatango Formation
Nis Hollow member, Schykill county -
From the album: Mahatango Formation
Undetermined crinoid, niss hollow member. -
While researching what caused the current invertebrate fossil of the month to have such a wonderful iridescence (www.thefossilforum.com), I came across some interesting info on preservation of color patterns in fossil shells. In Northern California where I live, most of the color of a fossil shell disappears after a few thousand years. The pattern of color is gone in a couple million years. While in Texas, I collected Texigryphea from the early Cretaceous that still had color patterns of dark radial bands. Finding a paper about Devonian brachiopods with color patterns surprised me. See: http://www.bioone.org/doi/full/10.4202/app.2010.0066 “First Colour-Patterned Strophomenide Brachiopod from the Earliest Devonian of Podolia, Ukraine” by Andrzej Baliński, found in Acta Palaeontologica Polonica 55(4):695-700. 2010. The first figure below shows the spotted pattern found on the convex shell of a strophomenid brachiopod from Ukraine. Wow, what a camouflage! The brachiopods blended right in against the light-colored rock with dark spots. I am reminded of well camouflaged modern mottled and spotted moths that are hard to see when they are on certain trees and rocks. The second figure shows a variety of color patterns found in fossil brachiopods. The paper suggests that brachiopods with colors and patterns occur in shallow water in the photic zone and in areas with warmer water. Few are found in cold polar waters. A similar distribution of colored shells and mollusks exists today. Shallow tropical species are very colorful while polar and deep water species are not. Show us some of your older fossil shells with colored patterns: Cretaceous and older.
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Gyracanthus is a cartilagenous gnathostome possibly a stem or sister clade to the Chondrichthyans. Most common fossils found are the fin spines but scapulocoracoids are not uncommon. Fossils here are result of collecting over 8 years from 2013. diagnosis.—Medium-sized gyracanthid fish, maximum estimated body length approximately 1 meter. Maximum fin spine length estimated 375 mm. Ridge width constant at maturity, ridge width constant along insertion-exsertion boundary at maturity, interridge width equal to or less than ridge width. Cristate tubercles ≤2 mm height, ≤2mm width, 9-11/cm proximally on pectoral fin spines, 8/ cm proximally on pelvic fin spines, 15/cm proximally on dorsal fin spines where preserved. Major and minor axes on tubercle, apex oriented oblique to underlying ridge. Pectoral fin spine inserted approximately one-third the length of the fin spine, ridge width constant along insertion-exsertion boundary at maturity, maximum fin spine ridge chevron angle along leading edge 90°, ornamented ridge dorsal to posteromedial groove. Two types of pelvic fin spines, one narrower with extensive exserted area, one wider and more robust with extensive inserted area, both with inserted area extending greater than half the length of the spine. Pelvic fin spine ridges curved retrorse towards midline. Median fin spines approximately symmetrical, comparable to paired fin spines but smaller and straighter distinct anterior and posterior dorsal fin spines. Prepectoral ventral plate with more than 30 tubercle rows, largely subparallel, some bifurcating, curving to the middle only at the extrema, convergent towards the lateral edge; prepectoral ventral plate inserted area at least a third of the width of the plate.
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Taxonomy from Fossilworks.com. Alternative combination: Aspidosoma roemeri. Description from Südkamp, 2017, p. 134: "Encrinaster has many characteristics common with Euzonosoma. The differences are as follows. The elongated arms are strap-like, broadening distally until the disc edge and then tapering evenly as comparatively narrow arms to the arm tips. The interradial disc outline is convex to straight. The marginals are flat overlapping plates. The ambulacrals are more delicate, less rectangular than in Euzonosoma, and more sub-triangular in oral view." Identified by oilshale using Südkamp 2017. References: Schöndorf, F. (1910) Palaeozoische Seesterne Deutschlands. II. Die Aspidosomatiden des deutschen Unterdevon. Palaeontographica 57:1-63. Lehmann, W.M. (1957) Die Asterozoen in den Dachschiefern des rheinischen Unterdevons. Abhandlungen des Hessischen Landesamtes für Bodenforschung 21:1-160 Südkamp, W. (2017) Life in the Devonian. Identification book Hunsrück Slate fossils. Verlag Dr. Friedrich Pfeil. München 2017. ISBN978-3-89937-221-2.
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- aspidosoma
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I have this unnamed moroccan tilobite in my collection , now i want to know If somebody knows the exact species. I've done a little bit of research and found two species that match very well : Holladorps and Minicryphaeus Quaterspinosus . Or i am completly wrong and its a complete different species Length of the trilobite : 5 cm Found in : Erfoud, morocco
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Two excellent papers about the Early Devonian of Podolia References: VICTOR VOICHYSHYN (2011): THE EARLY DEVONIAN ARMOURED AGNATHANS OF PODOLIA, UKRAINE. PALAEONTOLOGIA POLONICA, No. 66, 2011, pp 1-211. Voichyshyn V.K. (2015): Devonian Fish Fauna. – Lviv, 2015. – 310 p. (Scientific collections of the State Natural History Museum; Issue 5).
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- devonian
- dniester formation
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All material was found in a lag deposit layer on SW side of highway Rt120. SYSTEMATIC PALEONTOLOGY SARCOPTERYGII Romer, 1955 TETRAPODOMORPHA Ahlberg, 1991 MEGALICHTHYIDAE Hay, 1902 Diagnosis—Osteolepiform distinguished by a cosmine cover to dermal bones in combination with a premaxillary tusk that interrupts or lies lingual to the premaxillary marginal tooth row, contact between the subopercular and the second submandibular bones, and a distinct rostral process of the supratemporal that is without cosmine cover (Borgen and Nakrem, 2016). Diagnosis—A species of Megalichthys that is distinguished from previously described species by the presence of a pineal series of bones, the presence of a triangular principal gular, and the lack of sensory canal pores on the postparietal.
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From the album: Moscow formation, Devonian, Erie co. New York, USA
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From the album: Moscow formation, Devonian, Erie co. New York, USA
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From the album: Moscow formation, Devonian, Erie co. New York, USA
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From the album: Moscow formation, Devonian, Erie co. New York, USA
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From the album: Moscow formation, Devonian, Erie co. New York, USA
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From the album: Devonian, Catskill Fm., Pennsylvania USA
Plant matter from this site is poorly preserved and often needle like leaves or stem fragments. -
We got an interesting old find from a closed locality in Germany. Comes from middle devonian and contains some parts of ?Bryozoans The former owner wrote coral on it, but no septa cound be seen. I think it is Bryozoa, but...? what do you think?
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From the album: Devonian, Catskill Fm., Pennsylvania USA
Lobe-finned fish scale -
From the album: Devonian, Catskill Fm., Pennsylvania USA
Predatory lobe-finned fish scale -
From the album: Devonian, Catskill Fm., Pennsylvania USA
Early freshwater shark tooth-
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- catskill fm
- devonian
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From the album: Devonian, Catskill Fm., Pennsylvania USA
Early freshwater shark tooth-
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From the album: Devonian, Catskill Fm., Pennsylvania USA
Early freshwater shark tooth -
From the album: Devonian, Catskill Fm., Pennsylvania USA
Placoderm armor -
From the album: Devonian, Catskill Fm., Pennsylvania USA
Placoderm armor -
From the album: Devonian, Catskill Fm., Pennsylvania USA
Plant matter from this site is poorly preserved and is often just leaves similar to pine needles or stem fragments -
From the album: Devonian, Catskill Fm., Pennsylvania USA
Lobe-finned fish tooth-
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- catskill fm
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