What's the difference between cambrian and graptolite?
Cambrian
Definition:
(a.) Of or pertaining to Cambria or Wales.
(a.) Of or pertaining to the lowest subdivision of the rocks of the Silurian or Molluscan age; -- sometimes described as inferior to the Silurian. It is named from its development in Cambria or Wales. See the Diagram under Geology.
(n.) A native of Cambria or Wales.
(n.) The Cambrian formation.
Example Sentences:
(1) He and colleagues in Germany and the US studied a database of fossil organisms that lived on the sea floor from the Cambrian period, about 500m years ago.
(2) Furthermore, the identification of vertebrate hard tissues in the oral elements of conodonts extends the earliest occurrence of vertebrate hard tissues back by around 40 million years, from the Middle Ordovician (475 million years ago) to the Late Cambrian (515 million years ago).
(3) The Cambrian period, which began more than half a billion years ago, marks the moment when major groups of animals first appeared as fossils in rock strata.
(4) In the past decade the picture has changed dramatically, and now includes invertebrates from the Cambrian formations of half a billion years ago, many species of birds, rats and mice, antelopes, cats, dogs, whales, and primates.
(5) – Cambrian, Ordovician, Silurian, Devonian, Carboniferous, Permian, Triassic, Jurassic, Cretaceous … 'What will survive of us is love', wrote Philip Larkin.
(6) The present results support the hypothesis that fever was selected as a way of defending against infection only after the period of the emergence of the molluscus, i.e., the early Cambrian period.
(7) Power cables have stopped services between Aberystwyth and Machynlleth, where the train lines had already taken a battering in recent weeks and parts of the Cambrian line had already been declared closed for some months to come.
(8) Paleontological data indicate that the earliest recognizable vertebrate remains, bone fragments of Upper Cambrian and Lower Ordovician heterostracan fishes, were deposited in a marine situation.
(9) This could explain the sudden presence in the fossil record of the early Cambrian of advanced and diversified metazoans, the earlier forms of which were essentially unpreservable.
(10) Therefore, molluscan hemocyanins already existed before the individual molluscan classes diverged in the early Cambrian.
(11) Dentine is present in the stratigraphically oldest (Cambrian) assumed vertebrate fossils, at present some only included as Problematica, and is cladistically primitive, relative to bone.
(12) In contrast, chemical versatility has generally decreased within groups from the pre-Cambrian to the Phanerozoic, partly as the result of apparent changes in the chemical environment and partly as the consequence of selection for efficiency and greater metabolic ease of handling of certain materials.
Graptolite
Definition:
(n.) One of numerous species of slender and delicate fossils, of the genus Graptolites and allied genera, found in the Silurian rocks. They belong to an extinct group (Graptolithina) supposed to be hydroids.
Example Sentences:
(1) Wow!” (Graptolites and trilobites are long-extinct marine animals).
(2) And if it is, the exciting thing is: what about all those graptolites – what if they were luminous?
(3) These long and short fibres have features in common with those found in the graptolites.