In particular, his scientific liaison with the Scottish geologist Roderick Murchison ( 1792-1871 ) made him a contributor to the discovery of the Silurian system, and the first systematic description of sedimentary rocks and their index fossils.
42.
A land vertebrate faunachron ( LVF ) is a time interval that is defined by the first appearance datum ( FAD ), or first occurrence, of a tetrapod index fossil and is commonly used to date Late Triassic and Early Jurassic terrestrial strata.
43.
There is a study of pollen samples taken from sediments of Swedish lakes by Trybom ( 1888 ), Pinus ( Pine ) and Picea ( Spruce ) pollen was found in such profusion that he considered them to be serviceable as " index fossils ".
44.
Because the method of Radiometric dating wasn't developed at that time, the age of rock strata had to be estimated from the presence of index fossils, and consequently, much of the geologists'efforts were spent in finding these index fossils.
45.
Because the method of Radiometric dating wasn't developed at that time, the age of rock strata had to be estimated from the presence of index fossils, and consequently, much of the geologists'efforts were spent in finding these index fossils.
46.
Gao and Ren went on to defend a Middle Jurassic age for the beds based on biostratigraphy ( the use of index fossils ), and the bed's relationship to a layer that is known to mark the Middle Jurassic-Late Jurassic boundary.
47.
Because " Scaphites " and its relatives in Superfamily Scaphitaceae are restricted to certain divisions of the Cretaceous ( " ca . " 144 to 66.4 million years ago ), they are useful in some areas as an index fossil.
48.
He is best known for pioneering faunal analysis of Silurian beds by means of index fossils, especially graptolites, and his proposal ( eventually adopted ) that the beds between the Cambrian beds of north Wales and the Silurian beds of South Wales should be assigned to a new geological period : the Ordovician.
49.
The exact age of the strata from which the remains of " Albalophosaurus " have been found is not known because of the lack of marine beds containing index fossils, but the Kuwajima Formation is known to have formed during the Early Cretaceous, most likely after the Berriasian and before the Barremian based on the ages of underlying and overlying formations.
50.
Invertebrate clades that are ( a ) " very important " as fossils ( for example, ostracods frequently used as index fossils ), and / or ( b ) " very abundant " as fossils ( for example, crinoids easily found in crinoidal limestone ), are highlighted with a bracketed exclamation mark "'[ ! ] " '.
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