carbonaceous sediments - ορισμός. Τι είναι το carbonaceous sediments
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Τι (ποιος) είναι carbonaceous sediments - ορισμός

EVIDENCE OF PREHISTORIC LIFE
Carbonaceous films; Carbonaceous film

Cyclic sediments         
  • High Atlas middle liassic carbonate platform of Morocco and succession of regressive, autocyclic, "shallowing upward" metric sequences.
  • Model of a virtual "shallowing upward" metric sequence observed on carbonate platforms all along the south tethyan margin (about 10.000km) during the Liassic. (Micro)fossils are identical from the Maghreb till Oman and furtheron.
  • "shallowing upward" sequences from two sections distant of 230 km; note the hurricane (tempestites and tsunami ?)levels with abundant displaced foraminifera on supratidal flat. Middle Liassic, Morocco.
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SEQUENCES OF SEDIMENTARY ROCKS THAT ARE CHARACTERISED BY REPETITIVE PATTERNS OF DIFFERENT ROCK TYPES (STRATA) OR FACIES WITHIN THE SEQUENCE
Cyclic sedimentation; Cyclic sediment; Rhythmic sediment; Rhythmic sediments; Depositional cycle
Cyclic sediments (also called rhythmic sediments) are sequences of sedimentary rocks that are characterised by repetitive patterns of different rock types (strata) or facies within the sequence. Processes that generate sedimentary cyclicity can be either autocyclic or allocyclic, and can result in piles of sedimentary cycles hundreds or even thousands of metres thick.
Small carbonaceous fossil         
  • A fragment of [[Silurian]] arthropod cuticle with attached setae, extracted by delicate acid maceration
Small Carbonaceous Fossil; Small carbonaceous fossils; Carbonaceous microfossil
Small carbonaceous fossils (SCFs) are sub-millimetric organic remains of organisms preserved in sedimentary strata.
Carbonaceous chondrite         
  • Gujba meteorite, a  bencubbinite found in Nigeria. Polished slice, 4.6 x 3.8 cm. Note the nickel-iron chondrules, which have been age-dated to 4.5627 billion years.
  • Murchison meteorite
  • NWA 3118, CV3
CLASS OF CHONDRITIC METEORITES
Carbonaceous Chondrite; Carbonaceous chondrites; C chondrite; Bencubbinite; CK chondrite; CH chondrite; CB chondrite; CO chondrite; CR chondrite; CV chondrite
Carbonaceous chondrites or C chondrites are a class of chondritic meteorites comprising at least 8 known groups and many ungrouped meteorites. They include some of the most primitive known meteorites.

Βικιπαίδεια

Carbonaceous film (paleontology)

A carbonaceous film or carbon film is an organism outline of a fossil. It is a type of fossil found in any rock when organic material is compressed, leaving only a carbon residue or film.

When an organism is buried under many layers of sediment, pressure and heat increase during diagenesis and if the organism lacks a hard skeleton, it will only leave this thin film of carbon residue on rock surfaces.

The soft tissues of organisms are made largely of organic carbon compounds. Sometimes, fossils contain only carbon. Fossils usually form when sediment buries a dead organism. As sediment piles up, the organism's remains are subjected to pressure and heat. These conditions force gases and liquids from the body. A thin film of carbon residue is left, forming a silhouette of the original organism called a carbon film. Plant fossils often occur as a residue or film of carbon.

The delicate fossils of the Burgess Shale include carbon film forms. Graptolites are an example of carbon film fossils.