7

Not really. Concretions are features of sedimentary rocks almost by definition. Here's my go at a definition; it essentially presupposes a sedimentary rock: Concretions are spatially discrete zones of above-average (compared to the rest of the rock) cementation by authigenic minerals. Common cements include calcite, quartz, siderite, and pyrite. ...


7

Like Michael, I find your question a little unclear, but the crux of it seems to be this: ... does science have to conclude [that a specimen is] just a rock because the composition is entirely from earth minerals? The answer is an emphatic no. There are lots of non-rocks out there, many of them manufactured by the (alleged) intelligence known as Homo ...


6

It's not completely clear what you're trying to ask here, but I'll have a go at it anyway. If earth only had them would science say there are ancient artifacts from a past civilization? The only way "science" would say there are ancient artifacts from a past civilisation is if there is evidence to support that. This is not some kind of default thing ...


6

This is not really my specialism, but in the absence of other answers so far, I'll give it a go. Firstly, to simplify the terms of the question a little bit, flint is a form of chert, so we don't need to distinguish the two terms: we can just talk about chert in general. Also, I'll ignore chert beds formed in siliceous oozes, since you're specifically ...


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