Designation of this subfamily followed many decades of confusion surrounding the type genus, " Halisaurus, " especially " H . sternbergii ", a species from the Mooreville Chalk Formation of Alabama and the Niobrara Chalk of Kansas.
32.
This usage of the terminology is prevalent in North America and is likely caused by early immigrants who brought the terms from England where most true flint ( that found in chalk formations ) was indeed of better quality than " common chert " ( from limestone formations ).
33.
The aggressive strategy, particularly in the Austin Chalk formation of South Texas where UPR pioneered the use of horizontal drilling, increased UPR's production by an average of 17 percent annually during Messman's years and made the company the largest independent driller in the United States.
34.
As mentioned earlier, not much is known about Appalachia, but some fossil sites, such as the Navesink Formation, Ellisdale Fossil Site, Mooreville Chalk Formation, Demopolis Chalk Formation, Black Creek Group and the Niobrara Formation have given us a glimpse into this forgotten world of paleontology.
35.
As mentioned earlier, not much is known about Appalachia, but some fossil sites, such as the Navesink Formation, Ellisdale Fossil Site, Mooreville Chalk Formation, Demopolis Chalk Formation, Black Creek Group and the Niobrara Formation have given us a glimpse into this forgotten world of paleontology.
36.
The largest-known species of " Enchodus " is " E . petrosus ", remains of which are common from the Niobrara Chalk, the Mooreville Chalk Formation, the Pierre Shale, and other geological formations deposited within the Western Interior Seaway and the Mississippi Embayment.
37.
In southern England, dry-fly fishing acquired an elitist reputation as the only reliable method of fishing the slower, clearer rivers of the south such as the River Test and the other chalk streams concentrated in Hampshire, Surrey, Dorset and Berkshire ( see Southern England Chalk Formation for the geological specifics ).
38.
In southern England, dry-fly fishing acquired an elitist reputation as the only acceptable method of fishing the slower, clearer rivers of the south such as the River Test and the other chalk streams concentrated in Hampshire, Surrey, Dorset and Berkshire ( see Southern England Chalk Formation for the geological specifics ).
39.
Just like the " Claosaurus " specimen, it is possible that the specimens of " Niobrarasaurus ", " Silvisaurus " and " Hierosaurus " floated into the Interior Seaway from the east, since these two species of nodosaurids were discovered in the famous chalk formations of Kansas and are not known from any location from Western North America.
40.
In 1845 he became professor of mineralogy and geology at strata of Germany in elaborate works entitled " Die Versteinerungen des Norddeutschen Oolith-Gebirges " ( " Fossils of the North German oolith formations "; 1836 39 ), " Die Versteinerungen des Norddeutschen Kreidegebirges " ( " Fossils of the North German chalk formations "; 1840 41 ) and " Die Versteinerungen des Harzgebirges " ( " Fossils of the Harz Mountains "; 1843 ).
