#3171: Geologic Core Sample

XKCD comic, described below.
Transcript
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[This shows a drill sample with various labels, in order from the top of the panel toward the bottom.]

[Against a short section of core:] Topsoil

[A more obviously granular shorter section with a diagonal transition:] Till

[A light and lightly-marked phase:] Granite bedrock

[Repeating the Topsoil appearance:] Bottomsoil

[A short/squat and possibly squeezed 'lump':] Roof of subway car

[A similar squeezed-out lump:] Floor of subway car

[A longer length of the 'granite' texture, within which...:] More granite

[Not quite half of a pipe-width, cut out as a gap perpendicular and not quite all the way across the core:] Municipal water main

[Slightly more grainy version of the 'granite':] Slightly different granite

[In a junction between 'granites', an squat, unidentifiable lump:] Piece of screaming spelunker's arm

[Within a longer granite layer, a short stretch of spiky/crystalline features:] Cool crystals with no resale value

[The same granite, an intrusion of mechanical-looking junk:] Mangled fragments of drillbit from previous attempt

[As per granite, but slightly more grainy:] Some boring intrusive rock that's basically granite but has a name like "diorite" or "andalite" that you always have to look up

[Dark, cobbly textured stone:] Netherrack

[Within a stretch of granite, a short, dark but otherwise unidentifiable lump:] Balrog wing

[At this point, there is a discontinuity indicating that an arbitrary length has been omitted. The sample then resumes:]

[Still 'granite': Granite

[Dark soil texture:] Topsoil

[Light, fine and sparse 'grains':] Cement

[Two very short cross-sections, each with contrasting wood-grain stripes:] Floorboards

[Two very short sections with a textile-base plus piles appearance:] Carpet

[A mish-mash of 'stuff', possibly including cloth, metal components, grainy wood and 'topped' at the lowst end by something equally puzzling at an angle:] Possesions of a confused and angry homeowner in the other hemisphere


(Sourced from explainxkcd.com)

Title text:If you drill at the right angle and time things perfectly, your core sample can include a section of a rival team's coring equipment.


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