Flashcards
Phanerozoic [Paleozoic cont...] (22)
Flashcards do conjunto (11)
- 1What was global sea level doing during the Cambrian?The global sea level was a transgression
- 2☼What was global sea level like during the Ordovician?☼The highest ever + 2 major regressions
- 3☼When was the highest sea level ever in Earth history?☼In the Ordovician
- 4☼What sort of climate did Earth experience during the Ordovician?☼It was a greenhouse (hothouse) and it was warm to hot.
- 5☼What happened, climate-wise, right at the end of the Ordovician?☼A short, severe ice age
-Centered on Gondwana
-Classic evidence is in Morocco - 6What are the major Cambrian sedimentary rocks around Laurentia?-Ring of shallow-water sandstones
-Ring of middle shelf shales
-Ring of outer shelf limestones & Dolostones
-Ring of deep water shales & limestones - 7What is the most common Ordovician rock type?Fossiliferous Limestones
- 8What events produce major or minor unconformities?Usually erosion from sea level regressions
- 9What distinctive type of sedimentary rock often occurs right above some of these major unconformities?-Clean sandstone
-Pure, Quartz, white sandstone - 10What sorts of sediment deposits are seen after the Taconic Orogeny?Wheathering and erosion left lots of shale, siltstone, and sandstone
- 11What is the Queenston Delta?The sediments left after the Taconic Orogeny (some maroon shales were left)