Paleozoic
The Paleozoic (or Palaeozoic) Era (/ˌpæliɵˈzoʊɪk/ or /ˌpeɪliɵˈzoʊɪk/; from the Greek palaios (παλαιός), "old" and zoe (ζωή), "life", meaning "ancient life") is the earliest of three geologic eras of t...
This is a rare glimpse of a swimming Feather Star... - Nature's Rich Palette
This is a rare glimpse of a swimming Feather Star (Crinoid).
Mesmerizing Feather Stars
Meet the feather star, an ancient species of marine invertebrate.
300 Million-Year-Old Giant Shark Swam The Texas Seas
Even sharks are bigger in Texas. Around 300 million years ago, predatory “supersharks” that stretched about 8.5 meters long — the length of a limousine — prowled the warm, shallow seas of what is now ...
Pre-Reptile May Be Earliest Known To Walk Upright On All Fours
Wandering an arid region of the ancient supercontinent of Pangea about 260-million years ago, the pre-reptile Bunostegos akokanensis is the oldest known creature to have walked upright on all fours, ...
Permian–Triassic extinction event - The Permian Mass Extinction
The Permian Mass Extinction which ocurred 250 million years ago, wiped out 95% of the existing species, and began the age of the Dinosaurs.
Cambrian
The Cambrian (/ˈkæmbriən/ or /ˈkeɪmbriən/) period is the first geological period of the Paleozoic Era, lasting from 541.0 ± 1.0 to 485.4 ± 1.9 million years ago (mya) and is succeeded by the Ordovicia...
Cambrian - Wikipedia
Cambrian explosion
The Cambrian explosion, or less commonly Cambrian radiation, was the relatively short evolutionary event, beginning around 542 million years ago in the Cambrian Period, during which most major animal ...
Cambrian explosion - Wikipedia
Cambrian-Ordovician extinction event
The Cambrian–Ordovician extinction event occurred approximately 488 million years ago (m.y.a.). This early Phanerozoic Eon extinction event eliminated many brachiopods and conodonts, and severely re...
Ordovician
The Ordovician /ɔrdəˈvɪʃən/ is a geologic period and system, the second of six of the Paleozoic Era, and covers the time between 485.4 ± 1.9 and 443.8 ± 1.5 million years ago (ICS, 2004). It follows t...
Ordovician - Wikipedia
Ordovician-Silurian extinction event
The Ordovician–Silurian extinction events, also known as the Ordovician extinction, were, combined, the second-largest of the five major extinction events in Earth's history in terms of percentage of ...
Silurian
The Silurian is a geologic period and system that extends from the end of the Ordovician Period, about 443.8 ± 1.5 million years ago (mya), to the beginning of the Devonian Period, about 419.2 ± 3.2 m...
Silurian - Wikipedia
Devonian
The Devonian is a geologic period and system of the Paleozoic Era spanning from the end of the Silurian Period, about 419.2 ± 3.2 Mya (million years ago), to the beginning of the Carboniferous Period,...
Devonian - Wikipedia
Late Devonian extinction
The Late Devonian extinction was one of five major extinction events in the history of the Earth's biota. A major extinction, the Kellwasser Event, occurred at the boundary that marks the beginning of...
Carboniferous
The Carboniferous is a geologic period and system that extends from the end of the Devonian Period, about 358.9 ± 0.4 million years ago, to the beginning of the Permian Period, about 298.9 ± 0.15 Ma. ...
Carboniferous - Wikipedia
Permian
The Permian is a geologic period and system which extends from 298.9 ± 0.15 to 252.17 ± 0.06 million years ago. It is the last period of the Paleozoic Era, following the Carboniferous Period and prece...
Permian - Wikipedia
Permian-Triassic extinction event
The Permian–Triassic (P–Tr) extinction event, colloquially known as the Great Dying or the Great Permian Extinction, occurred about 252 Ma (million years) ago, forming the boundary between the Permian...
Permian-Triassic extinction event - Wikipedia
Sinijanella
Sinijanella is an extinct genus from a well-known class of fossil marine arthropods, the trilobites. It lived during the early part of the Botomian stage, which lasted from approximately 524 to&#...
300 Million-Year-Old Giant Shark Swam The Texas Seas
Even sharks are bigger in Texas. Around 300 million years ago, predatory “supersharks” that stretched about 8.5 meters long — the length of a limousine — prowled the warm, shallow seas of what is now ...
Pre-Reptile May Be Earliest Known To Walk Upright On All Fours
Wandering an arid region of the ancient supercontinent of Pangea about 260-million years ago, the pre-reptile Bunostegos akokanensis is the oldest known creature to have walked upright on all fours, ...
Shifangia
Shifangia is an extinct genus from a well-known class of fossil marine arthropods, the trilobites. It lived during the Botomian stage, which lasted from approximately 524 to 518.5 million years ago. T...
Holopea
Holopea is an extinct genus of fossil sea snails, Paleozoic gastropod mollusks in the family Holopeidae.These molluscs were stationary epifaunal suspension feeders. They lived in the Paleozoic Era, Or...
Holopea - Wikipedia
Pterocoma
Pterocoma is an extinct genus of crinoid from the Late Jurassic of Europe.
Pterocoma - Wikipedia
Geology of Wales
The geology of Wales is complex and varied; its study has been of considerable historical significance in the development of geology as a science. All geological periods from the Cryogenian (late Prec...
Geology of Wales - Wikipedia