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The Ordovician Period
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The Ordovician Period
Alivia Perfetto
Febuary 24, 2023
What Era does this belong too?
The Ordovian Period took place during the Paleozoic Era, also referred to as ¨The Age of Fish.¨ It was active 490 million years ago.
The Age of Fish
Periods After
Pennsylvanian- Reptiles developed from amphibians
Mississipian- First seed plants appear
Devonian- Fish became the dominant animals
Silurian- Land plants and animals emerge
- The Mesozoic Era began after the Paleozoic Era, which brought forth reptiles.
Periods Before
- The Cambrian Period arose before the Ordovician Period, making it the first period of the Paleozoic Era. Explosion of life ocurred and the first ever fish species appeared in the fossil record.
Trilobites
Conodants
Crinoids
a type of marine animal that lived on the sea floors
these anomals are known to of eaten algae , dung or detritus, or being filter feeders
this animal was learned to resemble an eel with its worm-like body and small teetj
collected food from plankton and small particles of detritus
trilobites were found along seabeds , usually buried in sand and mud
for their main food source, Conodants fed on microscopic plankton
the adult crinoids were observed to be attatched to the sea bottom by a stalk- sea lillies
they were best known as predators , filter feeders, or scavengers that fed on smaller trilobites
Conodants were found in marine deposits and open ocean areas
Animal life
The unstalked crinoids are called feather stars
Plant Life During the Ordovician Period
Plant Life
- Plants were the first living species that appeared during this geological time period. They were first mostly seen as non-vascular forms and then continousely developed later on.
Algae
The Algae plant was a plant that floated on surfaces during this time period, or lived underneath ponds and streams. They were known to of lacked many structures that most land plants have including roots, stems, and leaves. Algae also lacked many multicellular reproductive structures that many plants need to function.
The fungi plant was known as a decomposer during the Ordovician period. Fungi is noticable when it starts fruiting. For example, it will appear as a mushroom or mold on other plants or foods. Fungi was wide-spread throughout the late Ordovician period in seas to decompose animal wastes.
Fungi
There were many other terrestial plants that never became completely classified within biological research. Some terrestial plants that arose were non-vascular plants. These were plants like mosses, liverworts, and other plants that evolved from the marine environments.
Terretial Plants
The Ordovician period is most known for its marine invertabrates that evolved
Unique Characteristics
The living community consisted of red and green algae along with graphtolites, trilobites, brachiopods, and the condodants (early vertabrates).
The first animals with bones were also known to have appeared during this period. These animals were all aquatic animals that were spread around the surrounding seas.
Significant Events
A series of plate collisions took place in Laurentia, SIberia, and Baltica which all become known as the continents of Laurussia. Most of the worlds land was brought together in the continent of Gondwana. Gondwana moved continousely to the south pole during this period, but came to rest at the ending.
The largest mass extinction occured during end of the Ordovician Period. It wiped away around 90% of marine animals and close to 70% of land animals. The extinction was believed to be caused by a dramtic climate change.
Researchers have discovered that there was a massive invasion of land by new plants during the Ordovician Period. This invasion was said to of cooled the climate and break out dramtic ice ages. The ice ages took place at the end of the period.