The radiating rings and lines on this rock face formed when it cracked. This feature is called a plumose structure, so-named due to its resemblance to the shape of a feather. A plumose structure forms when a rock fractures rapidly under tension; the core of the structure forms where the fracture originates and the surrounding bands form as the fracture expands.
The Io Moth is a very colorful North American moth in the Saturniidae family. Mature moths have a wingspan of 63–88 mm. This species is sexually dimorphic, males having bright yellow forewings, body, and legs, while females have reddish brown forewings, body, and legs. The males also have much bigger plumose (feathery) antennae than the females. Adult moths are strictly nocturnal, flying generally only during the first few hours of the night. The females generally wait until nightfall and then extend a scent gland from the posterior region of the abdomen, in order attract males via wind-borne pheromones.
If you ever get a chance to see these plates in real life it’ll be obvious why Gosse’s natural history books were so popular. The colored plates are even more vivid than those in this excellent digital copy at the Biodiversity Heritage Library.
Clematis columbiana is in the buttercup family Ranunculaceae. Commonly known as rock clematis, it is found along the Rocky Mountain Range from Texas and New Mexico north to British Columbia. As the name suggests, this species grows on rocky slopes and in montane forests near streams and creeks. Rock clematis is a vining species that produces nodding solitary lavender flowers. After pollination, the flowers turn into a dense head of achenes that have plumose bristles to aid in seed dispersal.