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I suppose the banding has to do with how deep (ie above or below sea level) the littoral was during the Pennsylvanian Period - this is the geological time when the Hindostan stone was laid down. In...

That's definite enough for me!

The Hindostans do vary enormously in the degree of finish they give - some can be quite coarse, some are stellar. Looks like you have a good one.

Regards,
Neil

Matt - the staining is caused by the presence of iron salts in the stone that gives the characteristic rusty colouring.

Regards,
Neil

The banding looks a bit odd for a true Hindostan (Indiana). The colour is Ok - they can be tan, whitish, orange-tinged, grey - but the bands seem too sparse and too far apart. When these stones...