Why learn about sedimentary rocks
Download
1 / 45

Why learn about Sedimentary Rocks - PowerPoint PPT Presentation


  • 78 Views
  • Uploaded on
  • Presentation posted in: General

Why learn about Sedimentary Rocks. Source of building materials Source of fossil fuels (oil,coal,etc) Fresh water source Evidence of past surface conditions Fossils. Sedimentary Rock: Clastic - particles deposited, cemented – like sandstone, shale

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha

Download Presentation

Why learn about Sedimentary Rocks

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.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Why learn about Sedimentary Rocks

  • Source of building materials

  • Source of fossil fuels (oil,coal,etc)

  • Fresh water source

  • Evidence of past surface conditions

  • Fossils


Sedimentary Rock:

Clastic - particles deposited, cemented – like sandstone, shale

Chemical - precipitation out of solution – like salt, gypsum, some limestone

Organic - accumulation of parts of plants and animals - swamps (coal), shells (limestone)


Sandstone


Conglomerate


Breccia


Coquina (kō-KĒ-na)


Chemical Sediments


Sedimentary Structures


Graded bedding


Kaibab Limestone - 250 million years old, forms the surface of the Colorado Plateaus.

Toroweap Formation - 255 million years old, mostly limestone.

Coconino Sandstone - 260 million years old, pure quartz sand, petrified sand dunes.

Hermit Shale - 265 million years old, soft, easily eroded shales

Supai Formation - 285 million years old, shale intermixed w/ limestone and sandstone. Fossilized muddy river delta that fed into an ancient sea.


Unconformity

Redwall Limestone - 335 million years old ocean limestones.

Temple Butte Limestone - 350 million years old, freshwater limestone.

Unconformity

Muav Limestone - 515 million years old, limestone that is separated by beds of sandstone and shale.

Bright Angel Shale - 530 million years old, mudstone shale with thin layers of sandstone and sandy limestone.


Tapeats Sandstone - 545 million years old; Ripple marks suggest formation in shallow seas.

Great Unconformity – almost 300 m.y. gap!

Chuar Group - 825 to 1,000 million years old, mixture of sandstone, limestone and shale.

Nankoweap Formation - 1,050 million years old, coarse-grained sandstone.

Unkar Group - 1,100 to 1,250 million years old, contains lava flows & sedimentary rx


Unconformity – Gap from 1.25 to 1.7 b.y.

Vishnu Schist and Zoroaster Granite - 1,700 to 2,000 million years old. The Vishnu schist – used to be sandstone, limestone, and shale

This Vishnu Schist and Zoroaster Granite roots of an ancient mountain range, taller than Rockies.


Playa (“dry” basin salt flat)


Salt mine:


Bonneville Salt Flats:


Q. Why is St. Louis covered with limestone and other ocean-formed sedimentary rocks?

A. Many reasons (need to talk about climate, plate tectonics, continental development)


ad
  • Login