fine-grained sediment
101Kimberella — Taxobox image caption = Cast of a partial Kimberella fossil. The bulges at the top of the image are the sides of the organism, and surrounded the rim of the creature; these are further flanked with a line which may represent the extent of a… …
102Fosile — Fossile Ammonite fossilisée …
103Fossile — Ammonite fossilisée …
104Fossiles — Fossile Ammonite fossilisée …
105Fossilisation — Fossile Ammonite fossilisée …
106valley — valleylike, adj. /val ee/, n., pl. valleys. 1. an elongated depression between uplands, hills, or mountains, esp. one following the course of a stream. 2. an extensive, more or less flat, and relatively low region drained by a great river system …
107Lotic ecosystems — are the ecosystems of rivers, streams and springs. Included in these environments are the biotic interactions (amongst plants, animals and micro organisms) together with the abiotic interactions (physical and chemical). [Angelier (2003)] Lotic… …
1081980 eruption of Mount St. Helens — Photograph of the eruption column, May 18, 1980 Volcano Mount St. Helens …
109Transgression (geology) — A transgression is a geologic event during which sea level rises relative to the land and the shoreline moves toward higher ground, resulting in flooding.Transgressions can be caused either by the land sinking or the ocean basins filling with… …
110Burgsvik beds — The Burgsvik beds are a sequence of shallow marine limestones and sandstones found near the town of Burgsvik in the southern part of Gotland, Sweden. The beds were deposited in the Upper Silurian period, around Ma|420, in warm, equatorial waters… …
