bright angel shale造句

• The Bright Angel Shale underlies and interfingers with Muav Limestone.
• However, a few of these monadnocks protrude up into the Bright Angel Shale.
• The Bright Angel Shale is located in the lower elevations of the Grand Canyon, Arizona.
• The eastern version of this shale can be found eastwards in Grand Canyon, as the Bright Angel Shale
• However, a few of these monadnocks protrude up into the Bright Angel Shale ( Isis Temple example ).
• The Cambrian "'Bright Angel Shale "'is the middle member of the 3-member Tonto Group.
• If you look into the canyon, you will see another plateau below, the nearly flat Tonto Platform atop Bright Angel shale, which is cut by the Colorado River.
• However, the summits of the highest monadnocks protrude up through the base layer Tapeats Sandstone and are blanketed by overlying Bright Angel Shale as can be seen at Isis Temple.
• The erosion resistant Tapeats Sandstone forms the platform, called Tonto Platform, that the two less erosion resistant upper layers, the Bright Angel Shale and Muav Limestone, rest on.
• From Ooh-ahh Point the trail turns around a few switchbacks in a natural break in the Bright Angel Shale to the junction with the Tonto Trail, 4?miles from the trailhead.
• The Muav is in-part younger than, and in-part grades into, the Bright Angel Shale which is less erosion resistant and is categorized as a slope-forming unit.
• The Bright Angel Shale consists of green and purple-red, siltstone and shale which is interbedded with red-brown to brown sandstone that is similar in lithology to the underlying Tapeats.
• The Bright Angel Shale in the group forms an aquiclude ( barrier to groundwater seeping down ), and thus collects and directs water through the overlying Muav Limestone to feed springs in the Inner Gorge.
• Today, the Tonto Group makes up the Tonto Platform seen above and following the Colorado River; the Tapeats Sandstone and Muav Limestone form the platform's cliffs and the Bright Angel Shale forms its slopes.
• The unit comprises the'base horizontal unit'of the platform around Granite Gorge ( Inner Gorge ) on the Colorado River, and because of its hardness, creates the Tonto Platform upon which the two " slope-forming ", highly erodable units, the Muav Limestone, and Bright Angel Shale lie.
• Ian, a geologist, has taught Kate about rocks, repeating their names _ " Vishnu Schist, Coconino Sandstone, Muav Limestone, the Toroweap Formation and Bright Angel Shale " _ like a mantra, and the world he presides over in the New Jersey suburbs seems as solid and as stolid as the world of rocks he loves.