first erathem and era of the Phanerozoic eonothem and eon
Factsheet
Etymology
Name formality Formal
Alternate spelling(s) Palaeozoic
Etymology
Name formality Formal
Alternate spelling(s) Palaeozoic
Wikipedia
en.wikipedia.org › wiki › Paleozoic
Paleozoic - Wikipedia
October 21, 2025 - The Paleozoic was a time of dramatic geological, climatic, and evolutionary change. The Cambrian witnessed the most rapid and widespread diversification of life in Earth's history, known as the Cambrian explosion, in which most modern phyla first appeared. Arthropods, molluscs, fish, amphibians, ...
USGS
usgs.gov › youth-and-education-in-science › paleozoic
Paleozoic | U.S. Geological Survey
Paleozoic (541-252 million years ago) means ‘ancient life.’ The oldest animals on Earth appeared just before the start of this era in the Ediacaran Period, but scientists had not yet discovered them when the geologic timescale was made.
I honestly feel that the early Paleozoic is the one of the most underutilized parts of earth’s history In documentaries
It certainly is. Can you imagine if Walking with Monsters had a full budget and could have done a six episode series instead of rushing through each time period in 10 minutes? First episode in the Burgess Shale or Sirius Passet, showcasing the wonderful life emerging in the Cambrian Explosion. Second episode in the Soom Shale, focused on the Hirnantian Glaciation and Late Ordovician Mass Extinction. Third episode in the Silurian-aged Pozary Formation of Czechia, which preserves both terrestrial plants in the early stages of the Silurian-Devonian Terrestrial Revolution and a eurypterid-dominated coastal marine environment. Fourth episode in the Cleveland Shale, featuring wondrous placoderms, chondrichthyans, actinopterygians, and sarcopterygians, and the Hangenberg Event that wipes them out. Fifth episode in Montceau-Les-Mines, featuring giant insects and some early tetrapods of the Late Carboniferous. Final episode in the Salarevo, with magnificent gorgonopsians, therocephalians, dicynodonts, and parareptiles getting murdered by a mantle plume boring through fossil fuel-rich rocks. More on reddit.com
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December 31, 2022Paleozoic Dinomischus Ruling
The discard happens when it resolves (as it's after the semicolon).
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December 29, 2018What are your favorite PALEOZOIC discoveries/Revelations of the 21st century so far?
https://www.sci.news/paleontology/youti-yuanshi-13150.html I've mentioned it a few times on here, but in terms of our understanding of panarthropod anatomy and structural evolution, I think Youti yuanshi is a new keystone. Youti is a larval dinocaridid (the group that includes radiodonts and their cousins) that was found in a carbonate nodule that displays perfect preservation of it's internal organs and structures. This is by far the best view of a dinocaridid we have gotten ever. More on reddit.com
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August 31, 2025The ENTIRE Paleozoic era deserves more attention
The Ordovician is the most highly unappreciated period imo. When people focus on the Paleozoic, it's always either the Cambrian or the Permian More on reddit.com
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February 13, 2025Does Paleozoic mean ancient?
According to the Greek roots, paleo- means "primitive" or "ancient", while zo- means "life." So, the term Paleozoic refers to the ancient life forms present during this time.
study.com
study.com › courses › science courses › earth science 101: earth science
Paleozoic Era | Definition, Events & Timeline - Lesson | Study.com
What ended the Paleozoic Era?
The Paleozoic Era was ended by the mass extinction event known as the Permian Extinction. Theories as to why this event occurred include climate change and a build-up of carbon in the environment.
study.com
study.com › courses › science courses › earth science 101: earth science
Paleozoic Era | Definition, Events & Timeline - Lesson | Study.com
What animals lived in the Paleozoic Era?
Animals that lived in the Paleozoic Era included marine life such as trilobites, fish, and sea sponges. Land life also evolved such as amphibians and reptiles.
study.com
study.com › courses › science courses › earth science 101: earth science
Paleozoic Era | Definition, Events & Timeline - Lesson | Study.com
Videos
08:01
What If You Lived in the Paleozoic Era? - YouTube
38:49
The Paleozoic Era: Life Before the Dinosaurs | Documentary - YouTube
22:54
Paleozoic Era- Geologic & Biological Evolution and Largest Mass ...
02:29:35
The Paleozoic Era (That We Know Of) Compilation | Lindsay Nikole ...
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The Paleozoic Era - YouTube
19:23
Life Before Mammals in the Late Paleozoic Era (When Animals Moved ...
Iowa Geological Survey
iowageologicalsurvey.uiowa.edu › iowa-geology › landforms-iowa › paleozoic-plateau
Paleozoic Plateau | Iowa Geological Survey - College of Engineering | The University of Iowa
The Paleozoic strata include fossiliferous rocks of Cambrian, Ordovician, Silurian, and Devonian age which originated as sediments accumulating on sea floors and along coastal margins of tropical marine environments that existed here between 300 and 550 million years ago.
University of California Museum of Paleontology
ucmp.berkeley.edu › paleozoic › paleozoic.php
The Paleozoic Era
The Paleozoic is divided into six periods: the Cambrian, Ordovician, Silurian, Devonian, Carboniferous (in the U.S., this is divided into the Mississippian and Pennsylvanian Periods), and Permian. Most of these names derive from locations where rocks of these ages were first studied.
Merriam-Webster
merriam-webster.com › dictionary › Paleozoic
PALEOZOIC Definition & Meaning - Merriam-Webster
The meaning of PALEOZOIC is of, relating to, originating in, or being an era of geologic history that extends from the beginning of the Cambrian to the close of the Permian and is marked by the culmination of nearly all classes of invertebrates ...
Encyclopedia Britannica
britannica.com › science › earth science, geologic time & fossils › fossils & geologic time
Paleozoic Era | Description, Climate, & Facts | Britannica
July 26, 1999 - Paleozoic Era, major interval of geologic time that began 538.8 million years ago with the Cambrian explosion, an extraordinary diversification of marine animals, and ended about 252 million years ago with the end-Permian extinction, the greatest ...
Study.com
study.com › courses › science courses › earth science 101: earth science
Paleozoic Era | Definition, Events & Timeline - Lesson | Study.com
January 19, 2016 - When was the Paleozoic Era? The Paleozoic Era is the longest and oldest era within the Phanerozoic Eon. The Paleozoic definition breaks down the term into its Greek units. Paleo means "primitive" or "ancient", while zo means "life".
U.S. National Park Service
nps.gov › articles › 000 › paleozoic-era.htm
Paleozoic Era (U.S. National Park Service)
During the Paleozoic Era (541 to 251.9 million years ago), fish diversified and marine organisms were very abundant. In North America, the Paleozoic is characterized by multiple advances and retreats of shallow seas and repeated continental ...
Live Science
livescience.com › planet earth › geology
Paleozoic Era: Facts & Information | Live Science
June 20, 2013 - The Paleozoic Era occurred from about 542 million years ago to 251 million years ago. It was a time of great change on Earth.
Biology LibreTexts
bio.libretexts.org › bookshelves › introductory and general biology › introductory biology (ck-12) › 5: evolution
5.9: Life During the Paleozoic - Biology LibreTexts
March 6, 2021 - The Paleozoic Era is literally the era of “old life.” It lasted from 544 to 245 million years ago and is divided into six periods. Major events in each period of the Paleozoic Era are described in Figure below.
Museum of the Earth
museumoftheearth.org › early-paleozoic
Early Paleozoic — Museum of the Earth
The corals, brachiopods, and crinoids that dominate the rest of the Paleozoic had only a minor presence in Cambrian oceans, and little or no life was on land.
University of Minnesota
cse.umn.edu › mgs › paleozoic-geology
Paleozoic Geology | Minnesota Geological Survey | College of Science and Engineering
The Paleozoic rock layers are more than 1,500 feet thick in some places and were deposited over a span of 130 million years during the three geologic time periods known as the Cambrian, Ordovician, and Devonian (Fig.
Reddit
reddit.com › r/paleontology › i honestly feel that the early paleozoic is the one of the most underutilized parts of earth’s history in documentaries
r/Paleontology on Reddit: I honestly feel that the early Paleozoic is the one of the most underutilized parts of earth’s history In documentaries
December 31, 2022 - In the Paleozoic The earth back then was covered in slime for a billion years before the big Cambrian explosion.
GeoKansas
geokansas.ku.edu › paleozoic-era
Paleozoic Era | GeoKansas
During the Paleozoic Era, which lasted 289 million years, plants and reptiles began moving from the sea to the land. The era has been divided into six periods: Permian, Carboniferous, Devonian, Silurian, Ordovician, and Cambrian. Several times during this era, seas appeared and disappeared ...
Geosciences LibreTexts
geo.libretexts.org › bookshelves › geology › an introduction to geology (johnson, affolter, inkenbrandt, and mosher) › 8: earth history
8.6: Paleozoic - Geosciences LibreTexts
August 25, 2025 - Since the younger rocks of the Phanerozoic are more common and contain the majority of fossils, the study of this eon yields much greater detail. It is further subdivided into three eras: Paleozoic (“ancient life”), Mesozoic (“middle life”), and Cenozoic (“recent life”).
ScienceDirect
sciencedirect.com › science › article › abs › pii › S001282522300199X
Astronomical time scale for the Paleozoic Era - ScienceDirect
July 25, 2023 - The Paleozoic Era saw a series of geologic events covering the Earth system. Continental collisions ended in the latest Precambrian, and Pannotia began to disintegrate (Murphy et al., 2009; Scotese, 2009, Scotese, 2021). The breakup of Pannotia resulted in the formation of new ocean basins such as the Iapetus and Rheic Oceans (Dalziel, 1977), and sustained sea-level transgression occurred (Haq and Schutter, 2008).
EBSCO
ebsco.com › research-starters › geology › paleozoic-era
Paleozoic Era | Research Starters | EBSCO Research
The Paleozoic Era, spanning from approximately 544 to 251 million years ago, is the oldest era of the Phanerozoic eon and marks a significant period in Earth's history characterized by diverse and complex life forms.
U.S. National Park Service
nps.gov › articles › series.htm
Series: Geologic Time Periods in the Paleozoic Era
During the Paleozoic Era (541 to 252 million years ago), fish diversified and marine organisms were very abundant. In North America, the Paleozoic is characterized by multiple advances and retreats of shallow seas and repeated continental collisions that formed the Appalachian Mountains.
PNAS
pnas.org › doi › 10.1073 › pnas.2013083118
A high-resolution record of early Paleozoic climate | PNAS
February 1, 2021 - Fossils provide a rich record of marine biodiversity through early Phanerozoic time (1), and tectonic history has been reconstructed, at least in part, from multiple lines of geological evidence (12), but early Paleozoic climate history is less well constrained (15, 16).