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Showing results for tags 'ypresian'.
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Amphiplaga is one of the rarer of the Green River fish fossils, making up some 1% of the total from Fossil Lake, its only known location. Amphiplaga belongs together with its close relative Erismatopterus to the family Percopsidae within the order Percopsiformes. Amphiplaga is best distinguished from Erismatopterus by its dorsal fin, which has three hard spines (the first one is very small) followed by 9 or 10 soft rays. Erismatopterus usually has two hard spines followed by 6 or 7 soft spines. Amphiplaga can reach up to 15cm with an average length of about 10cm while Erismatopterus does not exceed 12cm with an average length of about 5cm. The Order Percopsiformes is a small order of North American freshwater fishes that includes three families: Amblyopsidae (cavefishes); Aphredoderidae (pirate perches); and Percopsidae (trout-perches). Closely related to neither trout nor perch, trout-perches have characteristics of both the trout and perch families. They exhibit characters of the salmonids, such as an adipose fin, cycloid scales, and soft fin rays, as well as characters of the percids, such as dorsal and anal fin spines, and ctenoid scales. Trout-perch are generally silvery in appearance, often with a partially transparent appearance, and relatively large heads and eyes. They are small fish with weak fin spines, and an adipose fin similar to those of trouts. They feed on insects and small crustaceans. Fossil percopsids are only known from North America, the current home of the extant genus Percopsis References: E. D. Cope (1877) A contribution to the knowledge of the ichthyological fauna of the Green River shales. Bulletin of the United States Geological and Geographical Survey 3(4):807-819. Grande, L. (1984): PALEONTOLOGY OF THE GREEN RIVER FORMATION, WITH A REVIEW OF THE FISH FAUNA. THE GEOLOGICAL SURVEY OF WYOMING, BULLETIN 63,
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From the album: Vertebrates
Erismatopterus levatus (COPE, 1870) Eocene Ypresian Green River Formation Kemmerer USA -
This specimen belongs to a set of 9 specimens kindly presented by a good friend. Thank you to doushantuo for the link to Roux et al. (2019) paper.
- 2 comments
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- eocene
- pseudoconocrinus doncieuxi (roux 1978)
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This specimen belongs to a set of 9 specimens kindly presented by a good friend. Thank you to doushantuo for the link to Roux et al. (2019) paper.
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- conocrinus
- crinoidea
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From the album: Cuisian
Taille 11,50 et 10 cm -
Hi, i found that urchin in an area at the limit between upper ypresian and lutetian, about 52 Million of Years. It is 2,5 cm in lenght, 2 cm wide and about 1 cm in thickness.
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Hi All, I’m very much an amateur and new to this site / forum. This is my first post. Can anyone please help with identification. This object was found in the inter tide mud flat region of East Mersey Island, Essex County, England, UK. Cudmore Grove Park beach location. It appears to have many features resembling bone. There is an inner sponge like area on cross section - possible trabecular structure. The shape has a clear indent groove on the assessed outer surface. My first thoughts were that it could possibly be something like a Patella. Online searching suggests a possible Femur Head part. But then that may be my desire to believe. Can anyone suggest what it may be, and if bone not rock then what could it come from given the location and geology. Many thanks for any anticipated input. Regards, Bob
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The seller wasn't sure if the Crab was found near Huesa which is south of the Pyrenees in northern Spain near the Canyons of the Sierra de Guara.
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Hi all, my wife found this impressive vertebra on the beach at Walton-on-the-Naze this morning. Apart from it being from a bony fish, is there any way of narrowing down the species? It is from the London Clay deposits (Ypresian / early Eocene).
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From the album: Pyrenees forams
Nummulites perforatus, Upper Ypresian (Cuisian) stage, Catalan (SE) Pyrenees -
From the album: Pyrenees forams
Nummulites perforatus, Upper Ypresian (Cuisian) stage, Catalan (SE) Pyrenees -
From the album: Pyrenees forams
Assilina exponens, Upper Ypresian (Cuisian) stage, Catalan (SE) Pyrenees -
From the album: Pyrenees forams
Assilina exponens, Upper Ypresian (Cuisian) stage, Catalan (SE) Pyrenees -
From the album: Pyrenees forams
Assilina exponens, Upper Ypresian (Cuisian) stage, Catalan (SE) Pyrenees -
A tiny tooth of an Abdounia minutissima. Bought from an old collection. The site at which it was collected, the Egem quarry, is now unfortunately closed. (Thanks to @darktheumbreon for finding the family!)
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Prof. WALTER G. JOYCE, Department of Geosciences, University of Fribourg has been kind enough to try to narrow down the species: "Of the four species that are known from the Lower Eocene of Wyoming, I can rule out one right away (Palatobaena gaffneyi), but the remaining three species (Chisternon undatum, Baena arenosa, and "Baena" affinis) are impossible to distinguish fresh from the egg because the shell has not yet formed. True, Chisternon undatum has been described from the Green River Formation, but I think there is no reason to exclude the other two species, especially since only one individual has ever been scientifically described from that formation. Thus, your turtle is probably only to be referred to as Baenidae indet."
- 3 comments
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- baenidae
- chisternon
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Hi all, Here some sharkteeth found in Egem, Belgium. From the Yperian stage of the early Eocene (approx 50 mya). Anyone have a clue on the species? Have a nice weekend, Max
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Sphyraena bolcensis, a barracuda from Monte Bolca
oilshale posted a gallery image in Member Collections
From the album: Vertebrates
Sphyraena bolcensis Agassiz, 1844 Eocene Ypresian Monte Bolca near Verona Italy The genus Sphyraena (from Latin: "pike-like") belongs to the order Perciformes. Members of the genus Sphyraena, better known as Barracudas, are elongated fish, pike-like in appearance, with large pointed heads and jaws. The two dorsal fins are widely separated with the anterior fin having five spines, the posterior fin having only one spine and nine soft rays. The posterior dorsal fin is similar in size to the anal fin and is situated above it. Barracudas normally have an under bite with prominent sharp-edged fang-like teeth in sockets. The oldest known barracuda fossil found so far dates to the Eocene period. All members of the genus Sphyraena are voracious predators; they feed upon cephalopods and crustaceans but mainly prey on fishes. Young barracudas can be often seen in small schools. Adult barracudas are considered to be solitary when it comes to hunting. The great barracuda can swim up to 35 mph, yet it can move forward slowly with no apparent effort; thus increasing its stealth. Barracuda are found primarily in tropical and subtropical waters of the Atlantic, Indian, and Pacific oceans, but certain species such as the Great Barracuda lives in brackish water. -
From the album: Beginner collection
Astarte from the ypresian (53-46 MY) of El Kouif in the center-east of Algeria. -
From the album: Beginner collection
Gryphea oyster, ypresian (53-46 MY) phosphates of Algeria. -
From the album: Beginner collection
Gryphea oyster, ypresian (53-46 MY) phosphates of Algeria. -
Coralina algae + Homotrema rubrum (pink foraminifera)
fifbrindacier posted a gallery image in Member Collections
From the album: Beginner collection
Coralina algae + Homotrema rubrum (pink foraminifera) -
From the album: Beginner collection
Coralina algae + Homotrema rubrum (pink foraminifera) + tubes of worms. -
From the album: Beginner collection
Burrow of a crustacean, El Kouif, center-east of Algeria, found in the phosphate from the ypresian (53-46 MY). -
From the album: Beginner collection
Burrow of a crustacean, El Kouif, center-east of Algeria, found in the phosphate from the ypresian (53-46 MY).
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