BIO1130 Cambrian and Ordovician notes
There are no multicellular plants in the oceans
Most are photosynthetic single cells
Cambrian is in Paleozoic era
Called Cambrian explosion, because in this 70 million years. We have an explosion of every multicellular organism.
Wednesday October 31st, 2012
CAMBRIAN
Phanerozoic Eon
Eras:
Paleozoic (most recent : 550 Ma until now) – multicellular organisms in the oceans
The periods in the Paleozoic era are:
Cambrian
Ordovician: end is one of the 5 mass extinctions. So many organisms that appeared in Cambrian disappeared in Ordovician
We see for the first time multicellular animal like organisms appear in the oceans/continents are now forming/invertebrate come
Silurian
Devonian
Carboniferous
Permian
Mesozoic - multicellular organisms occurring on land
Cenozoic – end of dinosaurs and raise of birds and mammals
Lake Cambrian
Laurentia is plate that holds North America
Surrounding continental mass is a large continental shelf which is a shallow part of ocean with phenomenal light penetration which means lots high primary productivity, which has a good base of photosynthetic autotrophs that are then fed off by other things. And its on equator, which is the ideal location because of the warmth. EVERYTHING IS PERFECT! There are no plants on land though. Its all rock.
At cost line we see invertebrates and they will be fossilized here (Burgess shales)
As Laurentia travels around, continents shift and bash into Laurentia and mountains develop (Rocky Mountains!) on east of Rocky mountains because that is where shore line was.
Burgess shales – Yoho National park
Soft bodied were fossilized in deep water just off continental shelf of Laurentia 500 million years ago. They were laired upon over and over again and slowly became fossilized.
When you open up shale’s, you see an impression on both sides.
Major fossil finds in the world
In 1960, 1970s; Original impressions/ thoughts on shales were incorrect. They were fossil imprints of
Most are photosynthetic single cells
Cambrian is in Paleozoic era
Called Cambrian explosion, because in this 70 million years. We have an explosion of every multicellular organism.
Wednesday October 31st, 2012
CAMBRIAN
Phanerozoic Eon
Eras:
Paleozoic (most recent : 550 Ma until now) – multicellular organisms in the oceans
The periods in the Paleozoic era are:
Cambrian
Ordovician: end is one of the 5 mass extinctions. So many organisms that appeared in Cambrian disappeared in Ordovician
We see for the first time multicellular animal like organisms appear in the oceans/continents are now forming/invertebrate come
Silurian
Devonian
Carboniferous
Permian
Mesozoic - multicellular organisms occurring on land
Cenozoic – end of dinosaurs and raise of birds and mammals
Lake Cambrian
Laurentia is plate that holds North America
Surrounding continental mass is a large continental shelf which is a shallow part of ocean with phenomenal light penetration which means lots high primary productivity, which has a good base of photosynthetic autotrophs that are then fed off by other things. And its on equator, which is the ideal location because of the warmth. EVERYTHING IS PERFECT! There are no plants on land though. Its all rock.
At cost line we see invertebrates and they will be fossilized here (Burgess shales)
As Laurentia travels around, continents shift and bash into Laurentia and mountains develop (Rocky Mountains!) on east of Rocky mountains because that is where shore line was.
Burgess shales – Yoho National park
Soft bodied were fossilized in deep water just off continental shelf of Laurentia 500 million years ago. They were laired upon over and over again and slowly became fossilized.
When you open up shale’s, you see an impression on both sides.
Major fossil finds in the world
In 1960, 1970s; Original impressions/ thoughts on shales were incorrect. They were fossil imprints of