Editing Devonian (section)

=== Early Devonian ===
[[File:Mollweide Paleographic Map of Earth, 405 Ma (Emsian Age).png|thumb|A map of Earth in the [[Emsian]] stage of the Early Devonian (405 million years ago)]]
The [[Early Devonian]] lasted from {{period start|Early devonian}} to {{period end|Early devonian}} Ma. It began with the [[Lochkovian]] Stage from {{period start|Lochkovian}} to {{period end|Lochkovian}} Ma, which was followed by the [[Pragian]] from {{period start|Pragian}} to {{period end|Pragian}} Ma and then by the [[Emsian]], which lasted until the Middle Devonian began at {{period start|Middle devonian}} Ma.<ref name=ICSC>{{cite journal |last1=Cohen| first1= K.M.| last2= Finney|first2 = S.C.|last3 = Gibbard| first3 = P.L.| last4 =Fan|first4 = J.-X. |year=2013 |title=The ICS International Chronostratigraphic Chart| journal = Episodes|volume = 36| issue =3| pages= 199–204 | doi= 10.18814/epiiugs/2013/v36i3/002|url=https://stratigraphy.org/ICSchart/Cohen2013_Episodes.pdf |archive-url=https://web.archive.org/web/20150913145806/http://www.stratigraphy.org/ICSchart/Cohen2013_Episodes.pdf |archive-date=2015-09-13 |url-status=live |access-date=7 January 2021|doi-access= free}}</ref>
During this time, the first [[Ammonoidea|ammonoids]] appeared, descending from [[Bactritida|bactritoid]] [[Nautiloidea|nautiloids]]. Ammonoids during this time period were simple and differed little from their nautiloid counterparts. These ammonoids belong to the order [[Agoniatitida]], which in later epochs evolved to new ammonoid orders, for example [[Goniatite|Goniatitida]] and [[Clymeniida]]. This class of [[cephalopod]] molluscs would dominate the marine fauna until the beginning of the [[Mesozoic]] Era.