ECTASIAN

https://gcmd.earthdata.nasa.gov/kms/concept/ee9ef5b8-884f-4f1d-97bb-463e2f06ac6e

broader
https://gcmd.earthdata.nasa.gov/kms/concept/17813394-7d77-4d08-857a-d3b045d49600 original
narrower
ee9ef5b8-884f-4f1d-97bb-463e2f06ac6e original
change note
2019-11-13 09:58:33.0 [tstevens] Insert Concept
add broader relation (ECTASIAN [ee9ef5b8-884f-4f1d-97bb-463e2f06ac6e,423309] - MESOPROTEROZOIC [17813394-7d77-4d08-857a-d3b045d49600,423289]);
2019-11-19 08:26:34.0 [tstevens]
insert Definition (id: null
text: The Ectasian Period is the second geologic period in the Mesoproterozoic Era and lasted from 1400 Mya ago to 1200 Mya (million years ago). Instead of being based on stratigraphy, these dates are defined chronometrically. This period is interesting for the first evidence of sexual reproduction. The 1.2 billion years old Hunting Formation on Somerset Island, Canada, dates from the end of the Ectasian. It contains the microfossils of the multicellular filaments of Bangiomorpha pubescens (type of red algae), the first taxonomically resolved eukaryote. This was the first organism that exhibited sexual reproduction, which is an essential feature for complex multicellularity. Complex multicellularity is different from "simple" multicellularity, such as colonies of organisms living together. True multicellular organisms contain cells that are specialized for different functions. This is, in fact, an essential feature of sexual reproduction as well, since the male and female gametes are specialized cells. Organisms that reproduce sexually must solve the problem of generating an entire organism from just the germ cells.
language code: en);
definition The Ectasian Period is the second geologic period in the Mesoproterozoic Era and lasted from 1400 Mya ago to 1200 Mya (million years ago). Instead of being based on stratigraphy, these dates are defined chronometrically. This period is interesting for the first evidence of sexual reproduction. The 1.2 billion years old Hunting Formation on Somerset Island, Canada, dates from the end of the Ectasian. It contains the microfossils of the multicellular filaments of Bangiomorpha pubescens (type of red algae), the first taxonomically resolved eukaryote. This was the first organism that exhibited sexual reproduction, which is an essential feature for complex multicellularity. Complex multicellularity is different from "simple" multicellularity, such as colonies of organisms living together. True multicellular organisms contain cells that are specialized for different functions. This is, in fact, an essential feature of sexual reproduction as well, since the male and female gametes are specialized cells. Organisms that reproduce sexually must solve the problem of generating an entire organism from just the germ cells.
reference
text International Commission on Stratigraphy (http://www.stratigraphy.org/)
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in scheme chronounits original