Alexander PohleHere one of my favorite fossil #cephalopods for #FossilFriday:
Pentameroceras mirum from the #Silurian of #Gotland! Those narrow slits of the shell were likely where arms or eyes would stick out!
Lukas VFN 🇪🇺New fossil reveals the weird ‘tooth cushions’ of an apex predator from 425 million years ago https://theconversation.com/new-fossil-reveals-the-weird-tooth-cushions-of-an-apex-predator-from-425-million-years-ago-274122
Largest Silurian #fish illuminates the origin of osteichthyan characters https://www.nature.com/articles/s41586-025-10008-y
"The jaw would have been 17 cm long, suggesting an animal roughly 1 m long—the largest known jawed fish from the #Silurian... nothing prepared us for what turned up just few years later: a complete skull and jaws that revealed a creature far weirder than we could have imagined"
Resolviendo la incógnita 🌐El Arctinurus boltoni fue un trilobite del Silúrico medio (432-422 MdA) que superaba los 15 cm de longitud. Este espécimen pequeño de la lutita de Rochester, Nueva York, se ha conservado cubierto por braquiópodos.🏛️Museo Americano de Historia Natural #trilobite #silurico #silurian
Eddy Crosby
Tradicionalmente, se ha interpretado que el trilobite Deiphon nadaba y flotaba gracias a su glabela llena de aceite, pero tiene unos ojos diminutos y una terrible hidrodinámica que le hubieran entorpecido. No quiere decir que otros trilobites no lo hicieran. 📷GB3D Type Fossils #trilobite #silurico #silurian
💧🌏 Greg CocksLow Sinuosity Meandering Rivers Before Vascular Plants - Cambrian Tapeats Formation, Arizona, USA
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https://doi.org/10.1130/B38336.1 <-- shared paper
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#water #hydrology #Arizona #bars #braided #streams #Cambrian #channels #clastic #conglomerate #floodplains #fluvial #hydromorphology #sedimentation #landscape #LowerCambrian #meander #mechanism #migration #mudstone #Paleozoic #Plantae #pointbar #rivers #sandstone #sedimentary #Silurian #sinuosity #UnitedStates #USA #TapeatsFormation
@GSA
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https://doi.org/10.1130/B38336.1 <-- shared paper
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#water #hydrology #Arizona #bars #braided #streams #Cambrian #channels #clastic #conglomerate #floodplains #fluvial #hydromorphology #sedimentation #landscape #LowerCambrian #meander #mechanism #migration #mudstone #Paleozoic #Plantae #pointbar #rivers #sandstone #sedimentary #Silurian #sinuosity #UnitedStates #USA #TapeatsFormation
@GSA
George the GorillaA drawer of fossil sea-lilies, or crinoids. One of many drawers of Silurian reef fossils from the UK in the #NottNatHist Museum collections
Emilia Jarochowska 🇺🇦🌱
El tiempo geológico es esquivo. Intentamos medirlo utilizando fósiles, radioisótopos, yacimientos de cenizas volcánicas y secciones geológicas seleccionadas que mejor representan lo que ocurrió en un momento dado de la historia de la #Tierra. Estas secciones se denominan estratotipos y los límites importantes del tiempo geológico se marcan con puntas doradas. Hoy colocamos una punta dorada en un nuevo límite: el Aeroniano/Teliciano en el Silúrico inferior, en el afloramiento de El Pintado en Sierra Morena de #Sevilla, #Andalucía. #Silurian #geology #stratigraphy
Planetary EcologistSilurian (Geological periods 🌍)
The Silurian is a geologic period and system spanning 23.5 million years from the end of the Ordovician Period, at 443.1 Ma to the beginning of the Devonian Period, 419.62 Ma. The Silurian is the third and shortest period of the Paleozoic Era, and the third of twelve periods of the Phanerozoic Eon. As with other geologic periods, the rock beds that define the period's start and end are well ...
