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Index fossils include graptolites?
Graptolites are excellent index fossils because they have a short-lived existence in the geologic time scale and are widespread. They are useful for dating rocks and correlating layers in different locations, assisting in determining the age of rocks and reconstructing past environments.
Where did graptolites live?
They live in the Southern Pacific.
What has the author David K Loydell written?
David K. Loydell has written: 'Graptolites from the Upper Ordovician and Lower Silurian of Jordan' -- subject(s): Paleontology, Graptolites
What are graptolites?
Graptolites are extinct colonial marine organisms that lived from the Cambrian to the Carboniferous period, around 540 to 320 million years ago. They had a unique structure resembling tiny "tuning forks" and were important index fossils used for dating and correlating rock layers in geological studies.
What has the author Kate Marie Saunders written?
Kate Marie Saunders has written: 'Silurian dendroid graptolites'
What are index fossil and how are they used to determined the absolute age of sedimentary rock?
Index fossils can be used to help determine the relative age of rock layers. Index fossils are from species that only existed for a short time. Index fossils are found in rock layers. Trilobites and Graptolites are index fossils.
What are index fossils and how are they used to determine the absolute age of sedimentary rocks?
Index fossils can be used to help determine the relative age of rock layers. Index fossils are from species that only existed for a short time. Index fossils are found in rock layers. Trilobites and Graptolites are index fossils.
What has the author Lee F Braithwaite written?
Lee F. Braithwaite has written: 'Historical geology exercises' -- subject(s): Geology, Laboratory manuals, Paleontology, Stratigraphic Geology 'Graptolites from the Lower Ordovician Pogonip Group of western Utah' -- subject(s): Graptolites, Paleontology
What has the author A M Obut written?
A. M. Obut has written: 'Graptolity rannego silura v Kazakhstane' -- subject- s -: Graptolites, Paleontology
What has the author Nancy Hartshorne Kirk written?
Nancy Hartshorne Kirk has written: 'More thoughts on bithecae, budding and branching in the Graptolithina' -- subject- s -: Graptolites 'More thoughts on the construction and functioning of the rhabdosome in the Graptoloidea in the light of their ultrastructure' -- subject- s -: Graptolites, Graptoloidea 'Some thoughts on the construction of the rhabdosome in the Dendroidea, in the light of the ultrastructure of the Dendroidea and of Mastigograptus' -- subject- s -: Dendroidea, Mastigograptus
What has the author Barrie Rickards written?
Barrie Rickards has written: 'Spinners, spoons and wobbled baits' -- subject(s): Spin fishing, Fishing lures, Fishing 'Zander' -- subject(s): Zander fishing, Stizostedion, Zander 'Bendigonian graptolites (Hemichordata) of Victoria' -- subject(s): graptolites, taxonomy, systematics, biostratigraphy 'The Pike Angler's Manual' 'Plugs and plug fishing' -- subject(s): Plug fishing, Fishing plugs
What time period did graptolites live?
Graptolites first appeared in the Cambrian Period, 545-490 million years ago (mya), and evolved rapidly during the following Ordovician Period (490-434 mya) when the greatest variety of different forms lived. They suffered a major decline in the Silurian (434-410 mya) and only a few forms lasted into the Devonian. They finally became extinct during the Carboniferous Period, about 315 my ago.
