What Animals Were In The Silurian Period
The Silurian Period:
Plants Move Onto Land
The Silurian Period- giant bounding main scorpions, the commencement plants on country, coral reef builders, and major events shaping climate and geography on globe. Ah but the details... following the extinction event at the stop of the Ordovician Period in the Paleozoic Era, the Silurian began around 443 million years ago and lasted for 26 million years. Like the periods that have come earlier, information technology is named for an ancient Celtic tribe that lived in Wales where the kickoff geologic show was found.
The Silurian Climate
The climate was much warmer during the Silurian Menses. This caused the glaciers to melt and the seas to rise. Fifty-fifty though the sea level was rising, in that location were places where the land was slowly ascension too. This was due to mountain building every bit the continental plates collided. In these places the seas moved abroad from the coasts or evaporated from the shallow areas. This left salt deposits. Plants that had lived in the littoral water had to suit to life on country or dice.
Continents
Gondwana was yet located in the southern hemisphere, but it stretched from the Equator, where modernistic-day Australia was located, to the Southward Pole, where modern South America was located. The tectonic plate that contained North America was moving toward the southeast. Past the cease of this flow it would collide with some other plate and form a mountain range. Most of North America was covered past shallow seas during this time.
Life in the Seas of The Silurian Period
Of course, the warm shallow seas made good conditions for marine life to grow. The species that survived the mass extinction at the stop of the Ordovician Period branched out and developed new variations. Among these survivors were the nautiloids, brachiopods, bryozoans and crinoids. Crinoids were filter feeding echinoderms that grew on long stalks fastened to the sea bottom. They looked like flowers floating in the water. The long feathery arms caught the nutrient for the crinoid.
The Rise of The Eurypterids
Cephalopods were smaller and at that place were fewer of them than during the Ordovician Period. The Eurypterids or Bounding main Scorpions, made their first advent in the Ordovician Period. In the Silurian they became the dominant predator. Eurypterids were arthropods. Arthropods have an exoskeleton and jointed legs. Crabs, insects, and spiders are all arthropods. I of the Sea Scorpions of the Silurian grew to be ten feet long. Information technology was a huge predator that had large claws for snagging its prey.
Coral; The New Reef Builders
The new life in the Silurian Period was the coral reef. Tabulate corals and rugose corals formed these reefs in the Silurian rocks. Tabulate corals lived in colonies that formed bondage. The chains sometimes looked like clumps of organ pipes. Rugose corals are oft called horn corals because their shape looks similar the horn of a bull. The tentacles of the animal reached out the top of the loving cup. The huge reefs made groovy hiding places for the new animate being that lived in the body of water: the fish.
Fish Gain Importance During The Silurian
Fish were a growing in importance during the Silurian Period. At the beginning, most of the fish were jawless. These were some of the primeval vertebrates, animals with a soft cartilage backbone. By the terminate of the Silurian many fish with jaws and existent bones were pond in the waters. These animals would soon dominion the seas!
Cocksonia
Life On Land
Mosses and other primitive plants grew over the land near the water's edge. They continued the work of the lichen turning the stone into soil. In that location are a few fossils from the end of the Silurian Flow that show us early on insects lived among these mosses and fabricated their ain colonies.
The Cooksonia Invent Vascular Tissue
The soil made by the lichens grew strange plants called Cooksonia. These plants had stems, but no real leaves. Some Cooksonia had special tissues for carrying water and nutrients upward to the branching parts of the plant. This vascular tissue is common in modern plants, but was a starting time during the Silurian Period.
Go to Geologic Time Line
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