Sharks first appeared over 400 million years ago and swam the ancient oceans long before trees grew on land. Early sharks like Cladoselache had torpedo-shaped bodies built for speed in nutrient-rich waters. The first true trees appeared around 350 million years ago, with species such as Archaeopteris showing features of both ferns and modern trees. Life on land was harsh, with intense UV radiation and wild temperature swings, while the seas offered a stable environment. Sharks have survived five
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Sharks first appeared over 400 million years ago and swam the a…
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Before megalodon, researchers say a monstrous shark ruled ancient Australian seas
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Finding fossils and shark teeth older than megalodon! Cretaceous period! #fossils #sharkteeth #sharks #dinosaurs #history | Adventure Archaeology And Southern Diggers
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Sharks in Switzerland! #Asteracanthus “star spine” swam in Middle Jurassic Swiss seas. It was a shark of the hybodont “hump-backed tooth”flavor and reached ~10’ long, making it among the longest of the hybodonts. Its mouth is full of sharp, grasping teeth. Hyobodonts have a mighty spine on each of their two dorsal fins and the males have another on their head (we know they are males because of complete specimens replete with claspers). They are close cousins of extant sharks, which seemed to out
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