blackleaf造句

• It is equivalent to the lower Ashville Formation in southern Manitoba, the Skull Creek Shale in North Dakota and parts of the Blackleaf Formation in northern Montana.
• The Wayan is equivalent to the upper Cedar Mountain Formation of Utah, the Aspen Shale of Wyoming, and the Vaughn member of the Blackleaf Formation of Montana.
• Within this group is a subunit known as the Blackleaf Formation ( or the Albian Formation ), a shale with a small proportion of fine-to-medium grain sandstone.
• Fossils are known from the middle Cretaceous Blackleaf Formation of southwestern Montana and the Wayan Formation of southeastern Idaho, USA, both of the Cenomanian stage, roughly 95 million years ago.
• The StarTech Energy Corp . of Calgary, Alberta, had proposed drilling in Blackleaf Canyon, which is federal land, with leases issued before a 1997 moratorium on energy development on the front.
• At the bottom of the Blackleaf Formation is another geologic subunit, the Flood Member, a sandstone consisting of layers ( from top to bottom ) of very hard calcareous sandstone, fissile sandstone with concretions of ironstone or stained limestone, and medium-hard light-colored sandstone.