What are Some Silurian Organisms?
The Silurian is a geological period and the Silurian System is a stratum formed during the Silurian period. Silurian is better developed on the island of Gotland in the Baltic Sea, so it was called Gotlandian System.
Silurian
- Time of life-4500---4000--3500---3000--2500--2000--1500--1000--500--0-
- The Silurian enjoyed a relatively stable and warm climate, the extreme glacial contrast of the Ordovician before it, and the Devonian heat pole that followed. Sea levels rose from their Hernandian stage low in Silujan in the first half; they subsequently fell during the break, although smaller patterns were superimposed on this overall trend; fifteen are identifiable, and the highest The Silurian sea level reached about 140M above the minimum level.
- During this period, the
- The Silurian was the first period to see a wide range of terrestrial living fossils, in the form of moss like miniature forest lakes and streams. However, the terrestrial animal did not have a significant impact on the Earth until its diverse Devonian.
- The first fossil record of vascular plants, land plants whose tissues carry water and food, appeared in the second half of the Silurian period. The earliest known representative of this group is the parietal fern . Most of the sediments that contain the cysts fern are marine. Preferred habitats may be along rivers and streams. Baragwanathia appears to be almost as old, dating back to the early Ludlow ( 420 million years) and branching stems and needle-shaped leaves 20 10cm. The plant shows that its age is still high relative to its fossils. Fossils of this plant have been recorded in Australia, Canada and China. eohostimellaheathana is an early, possibly terrestrial, "plant" from the early age of Slujian (Lanweiwei) in compressed fossils. The chemical composition of its fossils is similar to that of vascular plants and fossils of algae.
- The first osteochondrophyte of the osteochondria appeared, represented by spiny magpies covered with bony scales; the fish reached considerable diversity and development activity. The great white shark, adapted from the first two or three supporting gill arches. A diversified species of plate-legs (sea scorpions)-some of which are shallow logs that are a few meters long in North American waters; fossils have been found in New York State. Minamata also appeared in the Silurian period. Brachiopods, bryophytes, molluscs, hederelloids, stick stones, sea lilies and trilobites are rich and diverse. Endophytic symbiosis is common in corals and foraminifera.
- Coral reef fossil abundance flakes; sometimes frequent but hardly recorded from rock at other points.
- The earliest animals that appeared in Central Silurian fully adapted to the terrestrial environment, including the millipede breathworm . Some evidence also suggests the presence of predatory trigonotarbid arachnoids and polypods in late Silurian. Predatory invertebrates indicate that simple food webs are in place, including non-predatory predators. Push back Devonian creatures, Andrew Jeram and others. 1990 proposed a food web based on food webs
- Silurian creatures (7 photos)