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Oxygen Levels were approximately 10% of what they are today. As photosynthesis only began in the Precambrian period the amount of carbon dioxide and oxygen in the atmosphere would be very small compared to modern times. In fact, human's probably wouldn't have been able to breath.

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What is the index fossil of the Cambrian?

Trilobites are one of the index fossils commonly found in Cambrian rock layers. These ancient arthropods lived in the seas during the Cambrian period and are used by geologists as markers for dating rocks from that time period.


Where were most of the continents during the Cambrian period?

During the Cambrian period, known as the "Cambrian Explosion," most continents were part of a supercontinent called Gondwana, situated in the Southern Hemisphere. North America and Europe were closer to the equator at this time.


Was there oxygen in the Paleozoic Cambrian period?

Yes, there was oxygen present during the Paleozoic Cambrian period, but at much lower levels compared to today. Oxygen levels were still increasing during this time due to the evolution of photosynthetic organisms, like algae and early plants.


The cambrain period was part of this era?

The Cambrian period was part of the Paleozoic era. It occurred roughly 541 to 485 million years ago and is known for the rapid diversification of multicellular life forms, often referred to as the "Cambrian explosion."


How did the Cambrian period end?

The Cambrian period ended around 485 million years ago with an event known as the Cambrian-Ordovician extinction. This extinction event is believed to have been caused by changes in the Earth's climate and sea levels, as well as volcanic activity. It resulted in the loss of many marine species, paving the way for the rise of new organisms during the subsequent Ordovician period.