1 / 6

LIMESTONES

LIMESTONES. Calcite (calcium carbonate) dominates Fine-grained Chalk (cliffs of Dover, England) Medium-grained Oolitic limestones Coarse-grained Coquina (broken shells loosely cemented) Fossiliferous limestones. CHERT. Microcrystalline silica (microquartz = silicon dioxide)

tacey
Download Presentation

LIMESTONES

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. LIMESTONES • Calcite (calcium carbonate) dominates • Fine-grained • Chalk (cliffs of Dover, England) • Medium-grained • Oolitic limestones • Coarse-grained • Coquina (broken shells loosely cemented) • Fossiliferous limestones

  2. CHERT • Microcrystalline silica (microquartz = silicon dioxide) • Many varieties: • Flint = gray due to organic matter • Jasper = reddish due to iron oxides • agate = banded structures • Scots Bay Formation at Ross Creek

  3. EVAPORITES • Precipitated crystals from • oceans • lakes • rivers • Halite (sodium chloride) • Gypsum (hydrated calcium sulfate) Death Valley, California

  4. COAL • Compressed, heated thick accumulations of organic matter • With little detrital sediment to form much ash • Environment: vegetation in a lush swamp • Well-known from Carboniferous Period of Nova Scotia

  5. Coalfields of Nova Scotia

  6. FOSSIL FUELS • Alteration of partly decayed and buried organic matter. • Coal solid rock • Petroleum liquid in pore • Natural gas gas (mostly methane) spaces • Coal is mostly from terrestrial plant matter, but petroleum and natural gas come mostly from marine animals, plants and micro-organisms

More Related