UPJOKE
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Upon discovery of some sandstone deposits in a dried-up river, Mr. Watson questioned Sherlock Holmes on how he could be so sure it's sandstone.

"Why, it's sedimentary, my dear Watson!"

What do you call a lazy sandstone?

A sedentary rock.

A Geologist from Alabama could tell you the chronological order of Sandstone Layers, but not their exact ages

You could see they're into Relative Dating.

...

*Sigh*

I know you expected that punchline. My apologies, when I'm under pressure my sediment jokes turn a little schist.

Please stay gneiss in the comments.

What do you call a Graveyard built on sandstone?

A sedimentary.

Holmes is on the case...

Sherlock Holmes is investigating a murder where the culprit had used a knife carved from Sandstone.
Dr. Watson finds the choice of murder weapon odd.
"Holmes, who would kill another man with an Igneous rock?"
"Sedimentary, my dear Watson, Sedimentary..."

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