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Please take it easy on me I’m new here.
I didn’t see much historical information about any previously existing Martian atmosphere. I can only assume if there was flowing water as recent as ~3Mya there would have been more of an atmosphere at the same time or maybe it’s more accurate to say this would be the approximate time frame Mars lost the majority of its atmosphere? But nothing about it’s expected composition. If anyone knows of any more comprehensive sources or papers on this subject I would appreciate a point in the right direction. If this is the wrong place to ask this question I do apologize. BogartTheGatus (talk) 03:40, 12 January 2020 (UTC)