04-27-2018, 01:51 PM | #31 |
Join Date: Oct 2005
Location: Ronneby, Sweden
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Re: Pre-human civilizations on Earth
How would the rebar fare if the concrete stayed intact?
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04-27-2018, 02:12 PM | #32 |
Join Date: Feb 2005
Location: Berkeley, CA
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Re: Pre-human civilizations on Earth
Probably poorly (and its corrosion would likely not be good for the concrete either).
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04-27-2018, 10:18 PM | #33 | |
Join Date: Jun 2006
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Re: Pre-human civilizations on Earth
Quote:
Clearly the planet had some really *weird* depositional environments back when concrete formed as a sedimentary rock. Probably whatever produced all the volcanic ash that went into these deposits also contributed to the co-occurring Q-N mass extinction.
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-- MA Lloyd |
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04-27-2018, 11:03 PM | #34 |
Join Date: Mar 2008
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Re: Pre-human civilizations on Earth
I remember reading that one of the most obvious long term things we would leave is old oil wells. Holes through millions of years of strata that are filled with concrete when played out. Leaves a odd looking trace.
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04-29-2018, 02:28 AM | #35 | |
Join Date: May 2010
Location: Alsea, OR
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Re: Pre-human civilizations on Earth
Quote:
If the civilization only got to, say, Roman Republic tech, we still get some odd deposit patterns... but not the clear vertical quarter-mile intrusions... because the Republic was capable of rather impressive tunneling. Multiple-mile tunnels for the aqueduct system. |
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04-29-2018, 11:07 PM | #36 | |
Join Date: Feb 2007
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Re: Pre-human civilizations on Earth
Quote:
Large masses of silicate glass can last a long time, too, at least as far as chemical alteration goes.
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HMS Overflow-For conversations off topic here. |
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04-29-2018, 11:09 PM | #37 | |
Join Date: Feb 2007
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Re: Pre-human civilizations on Earth
Quote:
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HMS Overflow-For conversations off topic here. |
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04-30-2018, 03:45 AM | #38 |
Join Date: Jul 2006
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Re: Pre-human civilizations on Earth
There are already plenty of people who think there were societies of various kinds existing before the ones that we currently know about - some of them, historically speaking, have proven to be right, others transparently barking. So yeah, getting all those "out of place artifacts" accepted as evidence rather than hoaxes and fringe/conspiracy theories is not a given.
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