Siroccopteryx is an extinct genus of anhanguerid pterodactyloid pterosaur which lived in Morocco during the Cenomanian stage of the Late Cretaceous. Some researchers, such as David M. Unwin, consider the genus a junior synonym of Coloborhynchus.

The genus was named and described in 1999 by Bryn Mader and Alexander Kellner. The name Siroccopteryx means "wing of the Sirocco", referring to the warm wind that originates in the North Africa and then goes through the Mediterranean, and the Greek word pteryx, a standard suffix for pterosaur genera that means "wing". The epithet of the type species S. moroccensis refers to its country of origin.

This pterosaur is known only from the front part of the jaw with teeth. The holotype fossil, LINHM 016 (Long Island Natural History Museum), was found near Ksar es Souk, in the province of Errachidia in the region of Meknes-Tafilalet at 30.4 ° N, 4.9 ° longitude (17.6 ° N, 4.2 ° W longitude) in Beg'aa, west of Hamada du Guiren in southeastern Morocco, in a layer of red sandstone, a fine-grained alluvium from the Albian to Cenomanian. It consists of front teeth and a snout that's not compressed. The muzzle was long and narrow, with a large elongated terminal part, along with some sort of shaped crest anterior keel higher than that of Anhanguera but not as high as that of Coloborhynchus or Tropeognathus. The teeth were sharp but short and more robust than in Anhanguera. The bone is rough and leathery, with strange marks of wrinkles and depressions, this may be a consequence of the conditions of preservation, but the descriptors suggest that indicate a disease, possibly caused by dental abscesses. According to André Veldmeijer, is probably that this damage was post-mortem and indicate the presence of a horn cover in the ridge.

The wingspan of this large pterosaur should be 4 to 5 meters (13 to 16 ft). It is likely that this animal was a specialized glider, and ventured into the sea off the coast of Africa, to capture fishes that swam near the surface.

Kem Kem Basin, Taouz, Morocco 1.41"

Late Miocene 13.8 to 16 mya

Pungo River Formation

North Carolina 

Otodus megalodon (/ˈmɛɡələdɒn/ MEG-əl-ə-don; meaning "big tooth"), commonly known as megalodon, is an extinct species of giant mackerel shark that lived approximately 23 to 3.58 million years ago (Mya), from the Early Miocene to the Early Pliocene epochs. This prehistoric fish was once thought to be a member of the family Lamnidae and a close relative of the great white shark (Carcharodon carcharias), but has been reclassified into the extinct family Otodontidae, which diverged from the great white shark during the Early Cretaceous.

3.52" size

This is a detailed, 4.6" long fossil fish (Knightia eocaena) from Fossil Lake Safari quarry near Kemmerer, Wyoming. It comes from a specific bedding plane at the quarry that is referred to as the mud layer. It's a volcanic ash layer which contains a mass mortality of different fish.

Knightia is an extinct genus of small, schooling, ray-finned fish related to modern herrings and sardines. Abundant in the warm freshwater lakes of the Eocene Green River Formation, they fed on insects, plankton, and tiny fish, while serving as prey for nearly every larger predator in the ecosystem. The most common species, Knightia eocena, reached about 15 cm in length and is celebrated today as the state fossil of Wyoming.

These streamlined fish are recognized by their heavy scales, small conical teeth, and rows of dorsal and ventral scutes along the body. Their fossils are among the most iconic from the Green River Formation—an exceptional 48-million-year-old lake deposit in Wyoming, Colorado, and Utah known for preserving a remarkably detailed snapshot of ancient life in a warm, lake-rich Eocene landscape.

50 million years ago, in the Eocene epoch, these fish thrived in Fossil Lake, which was fed by the Uinta and Rocky Mountain highlands. The anoxic conditions at the bottom of Fossil Lake slowed bacterial decomposition, prevented scavengers from disturbing corpses, and, most interestingly, suffocated creatures that ventured into the oxygen-starved aquatic layer. The result is a miraculous exhibition of Eocene biota: a subtropical aquatic community within sycamore forests, teeming with creatures such as freshwater stingrays, dog-sized horses, menacing alligators, early flying bats, and one of the first primates.

Eocene era

I love this so much!!! The detail is amazing for something so old. I love fossils, and I hope this will help somebody feel what I do about these incredible time capsules into geological time.

Knightia eocaena is an extinct species of small, schooling freshwater fish related to modern herrings. Living roughly 40 to 50 million years ago during the Eocene epoch, they are exclusively found in the remarkably preserved limestone deposits of the Green River Formation in Wyoming, Colorado, and Utah.

Size: Averaging 10 to 15 centimeters (4 to 6 inches) in length, K. eocaena is the largest of the three known Knightia species, capable of growing up to 25 centimeters.Diet: They fed on plankton, insects, and tiny fish, using their gill rakers and small conical teeth.Ecosystem Role: As a highly abundant schooling fish, they served as the primary food source for larger Eocene predators like Diplomystus, Mioplosus, and Phareodus.

Green River Formation, Fossil Lake safari quarry, Wyoming 

Devonian

Western Sahara, Morocco 

Late Cretaceous 66 mya

Hell Creek formation 

Montana 

Euzonosoma tischbeinianum is an extinct species of brittlestar (class Ophiuroidea) that existed approximately 380 million years ago during the Lower Devonian period. Famous for its exquisite preservation in the Bundenbach (Hunsrück) slate of Germany, these fossils are often naturally replaced with iron pyrite ("fool's gold")

It belongs to the order Oegophiurida and the family Encrinasteridae.Origin: Specimens are exclusively found in the Hunsrück Slate near Bundenbach, Germany—a geological region renowned for preserving soft-part anatomy.Locomotion: Unlike modern brittlestars that use muscular movements to "walk" across the sea floor, E. tischbeinianum utilized a form of podial walking (moving with their tube feet) due to the distinct structure of their arm ossicles.Preservation: The slate creates stunning visual contrast. Because the quarries for roofing slate have been closed for decades, these pyritized specimens are increasingly rare and sought-after by collectors.

Hunsrűck Slate

Bundenbach, Germany

Aturia is an extinct genus of Paleocene to Miocene nautilids within Aturiidae, a monotypic family, established by Campman in 1857 for Aturia Bronn, 1838, and is included in the superfamily Nautilaceae in Kümmel 1964.

Aturia is characterized by a smooth, highly involute, discoidal shell with a complex suture and subdorsal siphuncle. The shell of Aturia is rounded ventrally and flattened laterally; the dorsum is deeply impressed. The suture, one of the most complex in the Nautiloidea, has a broad flattened ventral saddle, narrow pointed lateral lobes, broad rounded lateral saddles, broad lobes on the dorso-umbilical slopes, and a broad dorsal saddle divided by a deep, narrow median lobe. The siphuncle is moderate in size and located subdorsally in the adapical dorsal flexture of the septum. Based on the feeding and hunting behaviors of living nautiluses, Aturia most likely preyed upon small fish and crustaceans.

Dhakia region, Morocco 

Eocene 

Saw shark Rostral spine

Huarra formation. Antofagasta, Chile.

Pristiophorus lanceolatus is an extinct species of sawshark that lived during the Cenozoic era (ranging from the Eocene to the Pleistocene epoch). Known primarily through its fossilized rostral spines and teeth, this ancient predator likely reached lengths of around 1.4 meters and used its elongated, saw-like snout to hunt.

An Otodus obliquus tooth is a highly prized fossil from a massive, extinct mackerel shark that lived roughly 60 to 40 million years ago during the Paleocene and Eocene epochs. As the earliest known ancestor of the legendary Otodus megalodon, its teeth serve as a fascinating connection to the dawn of the "megatooth" shark lineage. 

Khourbga, Morocco 

50-55 mya

Hemipristis curvatus is an extinct species of weasel shark which existed during the Eocene epoch. It was described by Dames in 1883.

New Bern, North Carolina USA

34-36 MYA

HEXANCHUS COLLINSONAE

Etymology -M. E. Collinson's Hexanchus

Species- Hexanchus collinsonae

Location- Europe

Diet- Carnivorous

56 mya- Nanjemoy Formation (Fisher-Sullivan bone bed) 

Hexanchus collinsonae (named after M. E. Collinson) is a species of prehistoric shark that was found in the Eocene London Clay beds. It is a member of the family Hexanchidae.

Extinct sand Tiger/Goblin shark.

Lower Demopolis formation-Mississippi USA

Scapanorhynchus had an elongated, flattened snout and sharp awl-shaped teeth ideal for seizing fish or tearing chunks of flesh from its prey. Scapanorhynchus normally did not exceed a total length of 4.15 metres (13.6 ft), although the largest teeth with height about 6 centimetres (0.20 ft) indicate an upper total length of 6.7 metres (22 ft).

Their extreme similarities to the living goblin shark, Mitsukurina owstoni, lead some experts to consider reclassifying it as Scapanorhynchus owstoni. However, most shark specialists regard the goblin shark to be distinct enough from its prehistoric relatives to merit placement in its own genus.

75 MYA Late Cretaceous (Campanian)

Extinct sand Tiger/Goblin shark.

Lower Demopolis formation-Mississippi USA

Scapanorhynchus had an elongated, flattened snout and sharp awl-shaped teeth ideal for seizing fish or tearing chunks of flesh from its prey. Scapanorhynchus normally did not exceed a total length of 4.15 metres (13.6 ft), although the largest teeth with height about 6 centimetres (0.20 ft) indicate an upper total length of 6.7 metres (22 ft).

Their extreme similarities to the living goblin shark, Mitsukurina owstoni, lead some experts to consider reclassifying it as Scapanorhynchus owstoni. However, most shark specialists regard the goblin shark to be distinct enough from its prehistoric relatives to merit placement in its own genus.

75 MYA Late Cretaceous (Campanian)

For other uses, see Megalodon (disambiguation).

Otodus megalodon (/ˈmɛɡələdɒn/ MEG-əl-ə-don; meaning "big tooth"), commonly known as megalodon, is an extinct species of giant mackerel shark that lived approximately 23 to 3.58 million years ago (Mya), from the Early Miocene to the Early Pliocene epochs. This prehistoric fish was once thought to be a member of the family Lamnidae and a close relative of the great white shark (Carcharodon carcharias), but has been reclassified into the extinct family Otodontidae, which diverged from the great white shark during the Early Cretaceous.

While regarded as one of the largest and most powerful predators to have ever lived, megalodon is only known from fragmentary remains, and its appearance and maximum size are uncertain. Scientists have argued whether its body form was more stocky or elongated than the modern lamniform sharks. Maximum body length estimates between 16.1 and 24.3 metres (53 and 80 ft) based on various analyses have been proposed, though the modal lengths for individuals of all ontogenetic stages from juveniles to adults are estimated at 10.5 meters (34 ft). Their teeth were thick and robust, built for grabbing prey and breaking bone, and their large jaws could exert a bite force of up to 108,500 to 182,200 newtons (24,390 to 40,960 lbf).

Megalodon probably had a major impact on the structure of marine communities. The fossil record indicates that it had a cosmopolitan distribution. It probably targeted large prey, such as whales, seals and sea turtles. Juveniles inhabited warm coastal waters and fed on fish and small whales. Unlike the great white, which attacks prey from the soft underside, megalodon probably used its strong jaws to break through the chest cavity and puncture the heart and lungs of its prey.

The animal faced competition from whale-eating cetaceans, such as Livyatan and other macroraptorial sperm whales and possibly smaller ancestral killer whales (Orcinus), although the inclusion of early Orcinus as a direct competitor is uncertain, as species such as Orcinus citoniensis were likely adapted for feeding on small fish and cephalopods rather than large marine mammals. As the shark preferred warmer waters, it is thought that oceanic cooling associated with the onset of the ice ages, coupled with the lowering of sea levels and resulting loss of suitable nursery areas, may have also contributed to its decline. A reduction in the diversity of baleen whales and a shift in their distribution toward polar regions may have reduced megalodon's primary food source. The shark's extinction coincides with a gigantism trend in baleen whales.

Squalicorax was a medium-sized shark, typically measuring about 1.8–3 metres (5.9–9.8 ft) long. The largest specimen of S. pristodontus, SDSM 47683, was significantly larger, measuring up to 4.8 metres (16 ft) long.

Their bodies were similar to the modern gray reef sharks, but the shape of the teeth is strikingly similar to that of a tiger shark.[citation needed] The teeth are numerous, relatively small, with a curved crown and serrated, up to 2.5–3 cm (0.98–1.18 in) in height. Large numbers of fossil teeth have been found in Europe, North Africa, and North America. Squalicorax is one of three Cretaceous lamniformes to garner serrations along with Pseudocorax and Galeocorax. The world's largest and most complete semi-articulated fossil of Squalicorax was found in 2014 in stores of the Canadian Fossil Discovery Centre in Morden, Manitoba, in Canada, where it is now displayed. It measures more than 3 m in length.[

Squalicorax was a coastal predator and scavenger, as evidenced by a Squalicorax tooth found embedded in the metatarsal (foot) bone of a terrestrial hadrosaurid dinosaur that most likely died on land and ended up in the water.[6] Other food sources included sea turtles, mosasaurs, ichthyodectid fish, and other marine life. Tooth marks from this shark have also been found on the bones of Pteranodon, but whether the shark actively snatched such large pterosaurs out of the air, attacked them as they dove after prey, or were simply scavenging is not known.

Queensland Zem- Ouled Abdoun Basin, Morocco. Cretaceous period 66 mya

Another beginner piece, these vary in size between 70cm to 50cm. There will be a lot more available soon, and once I tweak the site there will be information, location and timelines available for all fossils

Cretaceous-95 mya

Xixia Basin, China

The Pygurus marmonti is an extinct genus of prehistoric marine invertebrates, often classified as an ancient sand dollar or a flat, burrowing sea urchin. These fossils are highly sought after by collectors for their striking five-pointed star (pentameral) pattern and beautiful preservation.

Geological Age: Late Jurassic Period, approximately 150 million years ago.Habitat: These echinoids lived in warm, shallow marine environments, slowly moving and feeding while buried under soft seafloor sand or mud.Origin: The vast majority of Pygurus marmonti fossils on the market are sourced from the Sakaraha and Majanga regions of Madagascar.Appearance: They generally range between 50 to 90 mm in diameter. Fossils are frequently polished on the top side to accentuate their delicate internal structural details and natural symmetry.

Sakaraha, Madagascar 

Petrified wood is a fossil formed when ancient plant material is buried in sediment and minerals (like silica or quartz) gradually replace organic matter. This preserves the wood's cellular structure and rings in stone over millions of years.Key Geological & Formation FactsThe Process: Known as permineralization, mineral-rich groundwater flows through the buried wood, replacing cell walls with inorganic crystals.Colors & Hues: Minerals dictate the color; iron oxides create reds and browns, while manganese yields blues, purples, and blacks.Hardness: Because it is primarily composed of quartz, petrified wood typically rates a 6 to 7 on the Mohs hardness scale.Age: Specimens found today mostly date from the Paleozoic to the Mesozoic Eras, ranging from 40 million to over 200 million years old.

This is a .98" long tyrannosaur tooth from the genus Nanotyrannus, collected from the Hell Creek Formation in Montana. The enamel is weathered across the majority of the crown, though small areas of serrations remained preserved along both edges.

Nanotyrannus is a controversial theropod dinosaur from the Late Cretaceous of North America, known from a small number of fossils including the famous skull “Jane.” It was a relatively small, lightly built predator—about 15–20 feet long—with long legs, a narrow snout, and sharp teeth, suggesting speed and agility compared to the massive Tyrannosaurus rex. What makes Nanotyrannus especially intriguing is the debate over whether it represents a distinct genus or is simply a juvenile T. rex, with differences in skull shape, tooth count, and bone structure fueling ongoing discussion among paleontologists.

The tooth comes with a small acrylic display case.

Mosasaurs are not dinosaurs because they belong to an entirely different branch of the reptile family tree. While dinosaurs were terrestrial (land-dwelling) creatures, mosasaurs were fully aquatic marine reptiles closely related to modern snakes and monitor lizards. 

During the last 20 million years of the Cretaceous period (Turonian–Maastrichtian ages), with the extinction of the ichthyosaurs and pliosaurs, mosasaurids became the dominant marine predators. They themselves became extinct as a result of the K-Pg event at the end of the Cretaceous period, about 66 million years ago

Mosasaurs breathed air, were powerful swimmers, and were well-adapted to living in the warm, shallow inland seas prevalent during the Late Cretaceous period. Mosasaurs were so well adapted to this environment that they most likely gave birth to live young, rather than returning to the shore to lay eggs as sea turtles do.

The smallest-known mosasaur was Dallasaurus turneri, which was less than 1 m (3.3 ft) long. Larger mosasaurs were more typical, with many species growing longer than 4 m (13 ft). Mosasaurus hoffmannii, the largest known species reached up to 17 m (56 ft),[3] but it has been considered to be probably overestimated by Cleary et al. (2018).

Mosasaurs had a body shape similar to that of modern-day monitor lizards (varanids), but were more elongated and streamlined for swimming. Their limb bones were reduced in length and their paddles were formed by webbing between their long finger and toe bones. Their tails were broad and laterally compressed, terminating in a fluke-like structure that served as the primary source of propulsion.

Until recently, mosasaurs were assumed to have swum in a method similar to the one used today by conger eels and sea snakes, undulating their entire bodies from side to side. However, new evidence suggests that many advanced mosasaurs had large, crescent-shaped flukes on the ends of their tails, similar to those of sharks and some ichthyosaurs. Rather than use snake-like undulations, their bodies probably remained stiff to reduce drag through the water, while their tails provided strong propulsion. These animals may have lurked and pounced rapidly and powerfully on passing prey, rather than chasing after it. At least some species were also capable of aquaflight, flapping their flippers like sea lions.

While regarded as one of the largest and most powerful predators to have ever lived, megalodon is only known from fragmentary remains, and its appearance and maximum size are uncertain. Scientists have argued whether its body form was more stocky or elongated than the modern lamniform sharks. Maximum body length estimates between 16.1 and 24.3 metres (53 and 80 ft) based on various analyses have been proposed, though the modal lengths for individuals of all ontogenetic stages from juveniles to adults are estimated at 10.5 meters (34 ft). Their teeth were thick and robust, built for grabbing prey and breaking bone, and their large jaws could exert a bite force of up to 108,500 to 182,200 newtons (24,390 to 40,960 lbf).

Fragmentary serated specimen from Antwerp, Belgium. This one was from the Miocene, 14 to 5.6 mya.

A good starter for fossil enthusiasts or children wanting to start collecting. Whilst this is quite a good specimen, I've no information about it, so it's cheap!