A photo is not the rock. This page writes down what the picture shows, asks for the tests a camera cannot do, and stops at a candidate. It does not seal a well, a prospect, or an age.
Reading organ status…
Put a ruler in the frame when you can. A coin or a hand is only a rough size. Compton’s field rule still holds: measure, then name.
Pick the kind of picture. The tests below change with it. Leave it blank and the organ will guess the kind of picture, not the rock.
These remove impossible names. They do not prove one name. 10% dilute HCl: vigorous fizz is calcite, powder-only is dolomite, silence is not a carbonate. Steel is about Mohs 5.5. Grain size is Wentworth.
Only if you saw the beds in place. A loose specimen has no way-up.
A measured ruler is calibrated. A coin (~24 mm) or a hand (~180 mm) is a hint, and the reply will still ask for a real scale.
A bright spot is not gas. Amplitude is not a fluid. Say the display polarity and whether the axis is time or depth. Without polarity, a hard kick and a soft kick cannot be told apart.
The picture can support a look-alike. An age needs a taxon and a public range (Paleobiology Database), then a person. Cuttings can be caved from higher up the hole.
Naming Sabah or the Malay Basin does not make the guess stronger.
The upload stays in memory for this reply. Strike and dip are not read off a photograph — measure those with a compass.
Field habit from Compton, Geology in the Field: describe the outcrop before you interpret it, and compare grain size with a real scale. Wentworth cuts used here: clay/silt under 0.0625 mm, fine sand to 0.25, medium to 0.5, coarse to 2, gravel above that.