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Showing results for tags 'Miocene'.
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From the album: Fossil Amber and Copal: Worldwide Localities
La Toca Mine Cordillera Septentrional Santiago Province, Dominican Republic La Toca Fm. (Mamey Group) 20.43-13.65 Ma Specimen: 7.7g / 51x21x12mm Equipment: Samsung Galaxy S9 Plus BelOMO 10x Triplet Loupe Quantum 140lm LED Penlight Lateral view, 3mm body length; same individual as seen in related images. Contained within same amber piece as contains the Leptomyrmex ants, spider, muscoid and nematoceran flies, twig, and enhydros.© Kaegen Lau
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From the album: Fossil Amber and Copal: Worldwide Localities
La Toca Mine Cordillera Septentrional Santiago Province, Dominican Republic La Toca Fm. (Mamey Group) 20.43-13.65 Ma Specimen: 7.7g / 51x21x12mm Equipment: Samsung Galaxy S9 Plus BelOMO 10x Triplet Loupe Quantum 140lm LED Penlight Ventral view of a 3mm long formicine ant; same individual as seen in related images. Unfortunately, the mandibles are partially obscured by a small bubble. Contained within same amber piece as contains the Leptomyrmex ants, spider, muscoid and nematoceran flies, twig, and enhydros.© Kaegen Lau
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From the album: Fossil Amber and Copal: Worldwide Localities
La Toca Mine Cordillera Septentrional Santiago Province, Dominican Republic La Toca Fm. (Mamey Group) 20.43-13.65 Ma Specimen: 7.7g / 51x21x12mm Equipment: Samsung Galaxy S9 Plus BelOMO 10x Triplet Loupe Quantum 140lm LED Penlight Dorsal view of spider, 2mm body length. Some of the enhydros have movable gas bubbles within their chambers. Contained within same amber piece as contains the Leptomyrmex ants, formicine ant, muscoid and nematoceran flies, twig, and enhydros.© Kaegen Lau
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From the album: Fossil Amber and Copal: Worldwide Localities
La Toca Mine Cordillera Septentrional Santiago Province, Dominican Republic La Toca Fm. (Mamey Group) 20.43-13.65 Ma Specimen: 7.7g / 51x21x12mm Equipment: Samsung Galaxy S9 Plus BelOMO 10x Triplet Loupe Quantum 140lm LED Penlight About 7mm long, this inclusion has a wood-like appearance, with interesting surface texture. The image does not fully capture the surface detail. A reddish partial abdomen and attached legs of some arthropod are present at the left end of the twig. Contained within same amber piece as contains the Leptomyrmex ants, formicine ant, spider, muscoid and nematoceran flies, and enhydros.© Kaegen Lau
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From the album: Fossil Amber and Copal: Worldwide Localities
La Toca Mine Cordillera Septentrional Santiago Province, Dominican Republic La Toca Fm. (Mamey Group) 20.43-13.65 Ma Specimen: 7.7g / 51x21x12mm Equipment: Samsung Galaxy S9 Plus BelOMO 10x Triplet Loupe Quantum 140lm LED Penlight Lateral view of nematoceran fly (?Chironomidae), 1mm body length. Contained within same amber piece as contains the Leptomyrmex ants, formicine ant, spider, muscoid flies, twig, and enhydros.© Kaegen Lau
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From the album: Fossil Amber and Copal: Worldwide Localities
La Toca Mine Cordillera Septentrional Santiago Province, Dominican Republic La Toca Fm. (Mamey Group) 20.43-13.65 Ma Specimen: 7.7g / 51x21x12mm Equipment: Samsung Galaxy S9 Plus BelOMO 10x Triplet Loupe Quantum 140lm LED Penlight Ventral view, 1.5mm body length; same individual as seen in related image. Contained within same amber piece as contains the Leptomyrmex ants, formicine ant, spider, nematoceran flies, twig, and enhydros.© Kaegen Lau
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From the album: Fossil Amber and Copal: Worldwide Localities
La Toca Mine Cordillera Septentrional Santiago Province, Dominican Republic La Toca Fm. (Mamey Group) 20.43-13.65 Ma Specimen: 7.7g / 51x21x12mm Equipment: Samsung Galaxy S9 Plus BelOMO 10x Triplet Loupe Quantum 140lm LED Penlight Lateral view, 1.5mm body length; same individual as seen in related image. Contained within same amber piece as contains the Leptomyrmex ants, formicine ant, spider, nematoceran flies, twig, and enhydros.© Kaegen Lau
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Leptomyrmex neotropicus (Dominican Amber)
Barrelcactusaddict posted a gallery image in Member Collections
From the album: Fossil Amber and Copal: Worldwide Localities
La Toca Mine Cordillera Septentrional Santiago Province, Dominican Republic La Toca Fm. (Mamey Group) 20.43-13.65 Ma Specimen: 7.7g / 51x21x12mm Equipment: Samsung Galaxy S9 Plus BelOMO 10x Triplet Loupe Quantum 140lm LED Penlight The piece containing these inclusions is absolutely loaded with different arthropods, but the most spectacular inclusions are those of a swarm of 11 extinct Leptomyrmex ants: there are 9 complete and 2 incomplete individuals, averaging 3.5mm in body length. In a lighthearted interpretation, it appears as though the duo in this image are performing some acrobatic act, while half of another individual gives audience! Other prominent inclusions consist of a twig (7mm), spider (2mm), formicine ant (3mm), two muscoid flies (1.5mm), two nematoceran flies (possible chironomid at 1mm, heavily decomposed mycetophilid at 3mm), and numerous enhydros.© Kaegen Lau
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I found this last weekend, but had it put aside until now. It is from the miocene marine outcrops of the Dahan River. Now, this is tiny--we are talking 2mm in diameter. It's something, it stands out among the rock. But I am not sure if it is an extremely small sea urchin or not. I hope the pictures help. It was tricky to take a picture of because of its size. It's small, circular, with tiny ridges on each side.
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- miocene
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Taxonomy from Gaudant 1994. The fossil cyprinid fish from the Dietrichsberg site were independently described as Palaeoleuciscus dietrichsbergensis by E. Böhme in 1993 and as P. cf. etilius by J. Gaudant in 1994. Description (Gaudant 1994, p. 225. Translated from French by oilshale): Fossil cyprinidae from Dietrichsberg are generally small fishes with standard lengths mostly between 35 and 70 mm, although the range of observed standard lengths varies from 17.5 to 85 mm. In addition, two isolated heads preserved in the Staatliches Museum für Mineralogie und Geologie zu Dresden are from individuals whose standard lengths can be estimated at 227 and 250 mm respectively (specimens S.M.M.G.D. - ThT 121 and - ThT 122). The body is relatively slender, its maximum height being generally included 4.5 to 5 times in the standard length. The head, whose length represents nearly a third (28 to 33%) of the standard length, is relatively large. The caudal fin is bilobed; its length is generally equal to 1/4 to 1/5 of the standard length.“ Line drawing (Gaudant 1994, p. 231): Identified by oilshale. References: Böhme, E. (1993) Eine Untermiozäne Fischfauna (Teleostei, Cyprinidae) vom Dietrichsberg bei Vacha/Rhön. Freiberger Forschungsheft C 450, Paläontologie, p. 116-140. Gaudant, J. (1994) Sur la présence du genre Palaeoleuciscus OBRHELOVÁ (Poissons téléostéens, Cyprinidae) dans le Miocene inférieur ou moyen (?) du Dietrichsberg, près de Vacha (Thuringe). Paläontologische Zeitschrift 68, p.223-243.
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- dietrichsbergensis
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Hello everyone, I've recently acquired this tooth from Indonesia. The seller mentioned it is a tiger tooth but they don't have more information. Does anyone on the forum know about indonesian fauna from the miocene-pliocene? do you think the tooth is real or fake? Many thanks in advance for your help. Kind regards, A.P
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Aurora North Carolina Megalodons, Makos, Giant Whites
fossil_lover_2277 posted a topic in Fossil Hunting Trips
Made a recent trip to Aurora, North Carolina to fossil hunt the Pungo River formation. These are the Megalodon, Giant White, and Mako teeth I found. Also the last pic shows the nicest tiger and sand tiger shark teeth I found. Not shown are several hundred identifiable whale and dolphins bones of decent quality, including intact vertebrae (atlas, axis, thoracic, lumbar, and caudal all found, some with processes), ribs, jaw bones, flipper bones (carpals and phalanges), sperm whale and dolphin teeth. Also found amber, petrified wood, Trionyx turtle shell, crab claws, and much more.
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- aurora north carolina
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VIDEO: Ethiopian Amber ("Tertiary Sediments", 23-16 Ma)
Barrelcactusaddict posted a gallery image in Member Collections
From the album: Fossil Amber and Copal: Worldwide Localities
Ethiopian Amber Wenchit River Valley North Shewa Zone, Amhara Region, Ethiopia “Tertiary Sediments” (23-16 Ma) Lighting: 140lm LED Longwave UV (365nm) Specimens: Spec. A (Marcasite): 11.2g / 27x20x31mm (in image) Spec. B (Large Yellow): 8.0g / 41x30x20mm Spec. C (Flow Lines): 8.4g / 34x31x20mm Spec. D (Run [Large Half]): 5.3g / 24x21x17mm Spec. E (Run [Small Half]): 2.8g / 23x19x14mm Spec. F (Green Flow): 5.7g / 26x25x20mm Spec. G (Green Angular): 3.1g / 27x20x15mm Spec. H (Umber [Large Half]): 3.3g / 26x18x17mm Spec. I (Umber [Small Half]): 2.2g / 22x12x12mm *With the exception of Specimens D and E, all present slight matrix on the exterior, consisting primarily of siltstone. Specimen A has a large cluster of iron sulfide mineral concretions on its rear side, accounting for the majority of the piece's weight. Mining, Properties: While there are several other amber and copal deposits on the African continent, Ethiopian amber deposits discovered back in 2010 have proven to be the most productive: on average, at least 20kg is mined by the locals every year. The amber is hard, and ranges in color from dark brown, red, and yellow, as well as varying shades of green; the green coloration is a natural base color, although a green fluorescence can be seen in some Ethiopian material when exposed to high-intensity LED light or sunlight: similar green fluorescent response is seen in some Dominican, Mexican, and Myanmar ambers. The green base coloration seen in some Ethiopian amber was likely caused by significant pressure and heat: volcanic layers of basalt of varying thickness overlie and underlie the deposits, and acted as a natural autoclave. The size of recovered amber specimens ranges anywhere from 5-25cm in size. Geology and Age of Deposits: Amber is found in sandstone and siltstone layers along the valley walls of the Wenchit, Jemma, and Mugher rivers; the amber-bearing layers were originally attributed to the Debre Libanos Sandstone, a Cretaceous geological Formation within the Blue Nile Basin 200-500m thick: this assignment was based on local observations, a geological map, and fossil spore identification. However, due to incorrectly-dated and some then-unidentified fossil spores, as well as arthropod and plant inclusions from genera with living relatives, the amber is believed to be Early Miocene in age. The amber occurs not in the Debre Libanos Sandstone, but in Tertiary sediments comprised of siltstone and sandstone situated between basalt layers, which often display columnar jointing. These basalt flows vary in age from Early Oligocene (~30 Ma) to Quaternary (2.58 Ma to Recent). Inclusions, Botanical Source: Ethiopian amber is frequently rich in inclusions, especially bacteria and fungal spores; plant inclusions include liverworts, various angiosperms, and rare examples of mosses and lichens; arthropods are abundant, including mites, spiders, and over 13 families of hexapods (e.g., beetles, flies, ants, etc.). Comparing the spectrographic results of Ethiopian amber with Dominican and Mexican ambers, has shown that this is a Class Ic resin, most likely produced by a member of the Fabaceae family; fossil leaves and flower parts of trees belonging to the Hymenaea genus have been found in this amber, adding weight to the chemical analysis’ findings. Sources: “A review of copal and amber occurrences in Africa and their paleontological significance.”; Bulletin de la Société géologique de France, 2020, 191 (1), p. 17; Valentine Bouju, Vincent Perrichot “On the ages of flood basalt events Sur l’âge des trapps basaltiques”; Comptes Rendus Geoscience, Volume 335, Issue 1, pp. 113-140; Courtillot, Renne 2003 “Stratigraphic and structural evolution of the Blue Nile Basin, Northwestern Ethiopian Plateau”; Geological Journal Issue 44, pp. 44, 47-50; N. Gani, et. al. 2008© Kaegen Lau
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Hey everyone! On my outings, I usually don't pick up the bone fragments, but I have stumbled upon a rather large pocket of good sized bone fragments that I would love some help in identifying. If no dice here, I'll get whatever is left ID'd at a museum this weekend. Fossil #1 - Going to take my best guess and say a rib of some sort? Fossil #2 Fossil #3 Fossil #4 And finally Fossil #5 There is PLENTY more where these came from, I consolidated the other fragments into a small area, so in the off chance anything here is significant, I would be more than happy to retrieve the rest. Thank you for any help you can provide, I know bone fragments are quite common at GMR, but I just found it odd to see so many chunks within close proximity.
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Happy to share a moment I’ve been waiting a long time for… FullSizeRender.MOV
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Hi all, I went to visit a new site yesterday that I had found mentioned in some literature from the early 1900s. It was a great day no doubt, and I was hoping to get some input on a few things. Stubby tooth I believe is a horse, but I’m not as sure about the long thin one, never found one quite like it. My largest piece is a camel(?) calcaneus and the small collection of toe bones were from a 1’ x 1’ area- all associated from the same animal I assume. They look camel to me, but much smaller than any I’ve ever found before. Any ideas? As best I can tell the formation was dated to 10-30myo but I cannot find much else in literature. thanks as always for the wisdom!
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Have made several trips, lots of teeth (mostly small and broken), but have done better than usual on cow shark. Nothing particularly dramatic. A few interesting things will post ater for ID. Generally mostly sand tiger per usual (and a few at top left not clear what they are to me). Not as many with cusps, some sites were gravel and shell bit holes; a long rough history of washing in the sand perhaps. Highlights (second) some verts, bunch of angel shark teeth, lots of drum teeth, a few sand tiger parasymphysials, one pretty just over an inch mako, and three cow sharks (been a good year so far for those; mostly I find broken). Last photo is of the smaller stuff. .
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Ethiopian Amber (Debre Libanos Sandstone; 23-16 Ma)
Barrelcactusaddict posted a gallery image in Member Collections
From the album: Fossil Amber and Copal: Worldwide Localities
4.7g polished specimen of amber from one of several deposits near Alem Ketema, Amhara Region, Ethiopia; piece measures 35x24x17mm. There is a thin vein of transparent material, while the rest is heavily included with organic detritus; some small fragments of plant material are seen in the transparent portions (see associated photo). The green coloration is partly due to the amber's autofluorescence initiated by the LED light (transmitted) during photography; the clear portions of this specimen present a yellow-green base color in incandescent light, and emit a greenish fluorescence in sunlight or LED light. Ethiopian amber deposits have been described relatively recently (2010), and the amber occurring in the siltstone layer of the Debre Libanos Sandstone was initially believed to be Cretaceous in age; later studies have proven the initial determination to be false, and further study of palynomorph and insect inclusions have provided a new estimated age of Early Miocene. The amber-bearing layer is over- and underlain by basaltic layers, some of which display columnar jointing; volcanic-derived pressure and heat has naturally changed the base color of some of this amber to varying shades of green. This amber is also believed to possibly have been produced by a member of the Hymenaea genus.© Kaegen Lau
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Ethiopian Amber (Debre Libanos Sandstone; 23-16 Ma)
Barrelcactusaddict posted a gallery image in Member Collections
From the album: Fossil Amber and Copal: Worldwide Localities
4.7g polished specimen of amber from one of several deposits near Alem Ketema, Amhara Region, Ethiopia; piece measures 35x24x17mm. This view of the specimen displays organic detritus inclusions: in particular, a long fibrous subject (at center, beneath fluorescent layer) can be seen. The green coloration is partly due to the amber's autofluorescence initiated by the LED light (transmitted) during photography; the clear portions of this specimen present a yellow-green base color in incandescent light, and emit a greenish fluorescence in sunlight or LED light. Ethiopian amber deposits have been described relatively recently (2010), and the amber occurring in the siltstone layer of the Debre Libanos Sandstone was initially believed to be Cretaceous in age; later studies have proven the initial determination to be false, and further study of palynomorph and insect inclusions have provided a new estimated age of Early Miocene. The amber-bearing layer is over- and underlain by basaltic layers, some of which display columnar jointing; volcanic-derived pressure and heat has naturally changed the base color of some of this amber to varying shades of green. This amber is also believed to possibly have been produced by a member of the Hymenaea genus.© Kaegen Lau
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- alem ketema
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Hi all, I was at Matoaka yesterday (Calvert Cliffs, Choptank Formation, Miocene), and happened upon this bone a little bit north of the main cliffs. It looks like either a carpal or tarsal bone. Definitely heavier, fossilized bone. Possibly a terrestrial mammal of some kind? If anyone has any ideas, I'm not as familiar with the land-dwellers of the time period.
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Hello everyone ! I found this bone and I presume it is a dolphin's jaw, I found it in a Miocene formation, sea bed, also shark teeth. But maybe I'm assuming wrong, I'll let you guys tell me what it is. Greetings! Here is a photo of how I found it. A part of the middle is missing, the rest was very broken. Below I leave photos of what else I could rescue.
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Almost 40 hours of prep and then a bunch of editing and this is what I ended up with. Enjoy
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Just got this 10,5 centimeter whale tooth (with Matrix) from Chile. What could the specimen ID be?
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This isn’t one of my personal fossils but is part of the fossil exhibit at the Gateway Science Museum in Chico where I work. I’ve posted some stuff from this in other threads here but we’ve been questioning this particular one a bit. The fossils come from the Mehrten Formation in Central California and were dated to 8.2 million years old. These are associated finds and have been tentatively identified as belonging to a Rhino. I don’t have a genus beyond it’s Rhino. The lead fossil preparator, Sean Nies and I, both wanted to double check the ID. The tooth is a bit different than the other Rhino teeth from the site and the jaw pieces looked thinner than those in the reference books. Not saying the ID is wrong. Confirmation would be helpful though I am most definitely not an expert in Miocene mammals so my knowledge is limited. I just thought it was worth posting here and getting other opinions The tooth is 6.5 cm in height and 3.1cm wide.
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Fossil hunting trip to Kruibeke (Miocene of Belgium)
ziggycardon posted a topic in Fossil Hunting Trips
Hi everyone, A few months back I went on a fossil hunt with the BVP to a clay quarry with some miocene sands in Kruibeke (Antwerp, Belgium) in search for shark teeth. Some great finds were done that day by other members, like a big Megalodon tooth, some large Hastalis & Galeocerdo teeth, a couple of Somniosus microcephalus teeth, an Edaphodon antwerpiensis palate and a Neolithic tool to name a few of the best... Unfortunately we weren't that lucky as we found only a few smaller teeth, but I was happy with the finds nonetheless First up some on situ photo's which were shared on the fb page of the club (luckily cause I didn't take any) First up my personal best find of the day: A small pleistocene rodent incisor Some bivalves (Venus casina casina?) A ray dermal denticle Some ray teeth (Aetobatus sp.?) The only two larger shark teeth we found, both C. hastalis I believe
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- antwerp
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