#3088: Deposition

XKCD comic, described below.
Transcript
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[Cueball approaches Ponytail, chiselling a rock on a shoreline next to a river with shallow rolling hills in the background]

Cueball: What are you doing?

Ponytail: This river empties onto a passive continental margin.

[Cueball and Ponytail stand talking, Ponytail holding several flat rocks, in an otherwise empty and frameless panel]

Ponytail: If I chisel notes onto these rocks and throw them into the sea, they might be incorporated into some shale cliff in the distant future.

[Silhouetted scene of Ponytail as she throws multiple rocks off frame to the right, Cueball watching from behind her]

[From off-panel, sound effect of a rock hitting water:] PLOP

[Two 'bug-eyed aliens', sitting in personal 'hover-saucers' look rightwards at an exposed rock-face. A pick and shovel are left stuck in the ground, and one of the 'saucers' sports a mechanical arm currently holding a loose fragment of rock. There are three question marks above the alien on the left and two question marks next to the alien on the right]

[Panel label:] 100 million years later...

[Text originating from the held rock fragment:] This bedrock inspected by No. 5


(Sourced from explainxkcd.com)

Title text:P.S. If you have time travel, come to my birthday party Saturday!


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