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5

The short answer is no, because we always have some constraint of how old something is. Sometimes we have fossils with large date error bars, and often we do not know for how long that species existed. A large date range constraint in some cases, like archeology, might not be useful. If the specimen is taken without noting the location it was taken from, ...

5

The problem with the cancelling you suggested is that it is imposed globally for the PDE and not locally (just on the thin layer). Usually when we talk about vertically layered media we use a plane wave $\exp(i(\mathbf{k}\cdot\mathbf{x}-wt))$ trial solution (you can plug this in to confirm that it satisfies the PDE) and match boundary conditions at the ...

2

tl;dr I would suggest considering the borehole measurements as a vertical profile. In terms of the CF Convention it would be a featureType profile, which is described in the discrete sampling geometries section. I didn't include all reference to the relevant sections in the CF Conventions below. Just comment if import things are missing. Example netCDF ...

1

Is there such a reliable source so I can identify the stones by myself? Maybe. Most semi-precious stones are various forms of quartz or silica (e.g., agate, citrine, etc). Quartz is very hard and will scratch glass. It is hard to scratch quartz. Therefore, this is a non-destructive way for identification of quartz. It usually takes a really good polish ...

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