At the center of the sequence you find a rock (sample 8). It…

At the center of the sequence you find a rock (sample 8). It is smooth to the touch and breaks into sheets. Inspect sample 8 further. Montree/stock.adobe.com Visual Description A thin, flat, dark brown rock with uneven edges visible along the front and sides. Each layer of this rock is very thin and plate-like, with smooth, flat surfaces and sharp, straight edges. There are no visible large grains or crystals; the texture appears extremely fine-grained.

At the base of the sequence you find a rock (sample 9). It f…

At the base of the sequence you find a rock (sample 9). It feels like coarse sandpaper against your fingers. Inspect sample 9 further. Visual Description The rock is tan to sandy beige in colour and has a clearly granular, sandy texture, with tiny visible grains across its surface. The grains appear uniform in size and well sorted, giving the rock a relatively even appearance. Across the face of the rock are several subtle, wavy, parallel lines that run roughly horizontally from left to right. These lines appear as gentle ripples.