AA-2026-24D557
On the image
Somebody stood on this slope with a can of yellow paint and a job to do: mark the rock so it could be found again. The numbers 88 and 68, brushed on in a hand steadier than the footing probably allowed, belong to the quiet bureaucracy of mid-century geology, when a mineral survey or mining claim ran on hand-labeled samples long before anyone trusted a coordinate to do the same work.
The rock itself did the more interesting job without being asked, banding from deep plum to bone-white where mineral-rich fluids once moved through a fault and left their signature in color instead of words. The surveyor's numbers sit on top of that geologic record like a claim of ownership, confident that a can of paint could out-argue several hundred million years of metamorphism.
Whoever wrote 88 assumed the number would mean something to someone, eventually, in an office far from this cliff. The rock has kept its part of the bargain far longer than any file cabinet that once held the key to what 88 was actually supposed to prove.
The historian's note
The painted numerals visible on this outcrop are field-survey markers, a standard practice in mid-twentieth-century geological and mining exploration. Surveyors and prospectors marked rock faces directly with paint to identify sample locations, stratigraphic sections, or claim boundaries, cross-referencing the painted number to a logbook or map back at camp or in an office.
The strongly banded, purple-to-white coloration of the rock indicates a metamorphic or hydrothermally altered formation, where mineral-bearing fluids moved along fractures and left visible mineralogical staining. Such formations were frequently the target of postwar mineral exploration across the American West, when demand for copper, manganese, and other strategic metals drove extensive small-scale prospecting.
No mine name, company, or precise location is legible in the frame, so the specific survey this documents cannot be established from the image alone. The photograph nonetheless preserves a standard, low-technology method of field documentation used before GPS and digital mapping became routine tools of geological fieldwork.
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Painted Sample Numbers on Banded Purple Rock Face, 1960s Field Survey. 1960–1969. Archive & Atlas, Historical Image Library, AA-2026-24D557. https://thearchive.archiveandatlas.com/library/painted-sample-numbers-on-banded-purple-rock-face-1960s-field-survey.
@misc{aaAA202624D557,
title = {Painted Sample Numbers on Banded Purple Rock Face, 1960s Field Survey},
year = {1960–1969},
howpublished = {Archive \& Atlas, Historical Image Library},
note = {Accession AA-2026-24D557},
url = {https://thearchive.archiveandatlas.com/library/painted-sample-numbers-on-banded-purple-rock-face-1960s-field-survey}
}TY - ART TI - Painted Sample Numbers on Banded Purple Rock Face, 1960s Field Survey PY - 1960–1969 PB - Archive & Atlas, Historical Image Library AN - AA-2026-24D557 UR - https://thearchive.archiveandatlas.com/library/painted-sample-numbers-on-banded-purple-rock-face-1960s-field-survey ER -
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