geological column
21Mount Pinatubo — The eruption column of Mount Pinatubo on June 12, 1991, three days before the climactic eruption. Elevation …
22List of pterosaurs — This list of pterosaurs is a comprehensive listing of all genera that have ever been included in the order Pterosauria, excluding purely vernacular terms. The list includes all commonly accepted genera, but also genera that are now considered… …
23Edmontosaurus — Chordata Edmontosaurus Temporal range: Late Cretaceous, 73.0–65.5 Ma …
24Mount Meager — The Mount Meager volcanic complex rising above the Pemberton Valley. Summits left to right are Capricorn Mountain, Mount Meager proper and Plinth Peak …
25rare-earth element — /rair errth /, Chem. any of a group of closely related metallic elements, comprising the lanthanides, scandium, and yttrium, that are chemically similar by virtue of having the same number of valence electrons. Also called rare earth metal. [1955 …
26Neogene — Period 23.03–2.588 million years ago …
27Solar System — This article is about the Sun and its planetary system. For other systems, see planetary system and star system. For a list of physical and orbital statistics for the Solar System s largest bodies, see List of gravitationally rounded objects of… …
28Geologic record — The layer cake like appearance of concordant strata laid down over hundreds of thousands of years …
29Cambrian — For other uses, see Cambrian (disambiguation). Cambrian Period 542–488.3 million years ago …
30Azolla event — The Azolla event occurred in the middle Eocene period,citation author = Henk Brinkhuis, Stefan Schouten; year = 2006 title = Episodic fresh surface waters in the Eocene Arctic Ocean journal = Nature volume = 441 issue = 7093 pages = 606–609 doi …
