This is called absolute, isotopic, or radiometric dating.
Short spans of geologic time
Folds are geologic structures that are formed when rocks bend but do not break.
Mountain building
No. A caldera is a type of geologic structure formed by the collapse of a volcano.
Sedimentary rock was, and is, being formed in all geologic eras.
Dating a walrus tusk usually involves using radiocarbon dating techniques, which can determine the approximate age of the tusk by analyzing the decay of radioactive carbon isotopes present in the tusk. This method can provide an estimation of when the walrus lived and subsequently when the tusk was formed.
To accurately answer your question, I would need to know which specific fossils you are referring to, as different fossils can originate from various geologic periods. If you provide the names of the fossils or their characteristics, I can help identify the geologic period during which they formed.
Relative dating. (do your own study island)
An angular unconformity is formed when older tilted or folded rock layers are eroded, creating a flat surface, and then new horizontal layers are deposited on top. This type of geologic event typically involves periods of uplift, tilting, and erosion followed by subsidence and deposition.
The Llano Uplift is a roughly circular geologic dome of Precambrian rock, primarily Both may have been formed around the time of the Ouachita orogeny.
Yes, in a sense. Rocks can be metamorphosed multiple times, by different geologic events.
When it is two continental plates, new oceanic crust is formed, and when this continues, more oceanic crust is formed between the plates.