oryctocoenosis

oryctocoenosis

[ə‚rik·tə·sə′nō·səs]
(paleontology)
The part of a thanatocoenosis that has been preserved as a fossil.
References in periodicals archive ?
Material collected in previous years (1983-1998, 2009) comes mainly from the level of the 1st oryctocoenosis. All the material excavated at the Klunas fossil site is kept at the Natural History Museum of Latvia (collection No.
This conglomerate layer corresponds to the 1st oryctocoenosis represented mainly by separate compactly lying bones including large and very large plates, sometimes partly articulated skeletons and aggregates of sarcopterygian scales, as well as many fragments of bones.
The 2nd oryctocoenosis is associated with that part of bed 1.
Here, at the bottom of bed 2 the fossils of the 3rd oryctocoenosis are found within an intraformational conglomerate.
are known only from the 1st and the 3rd oryctocoenosis, while the remains of Dipnoi gen.
Bothriolepis ornata dominates the 1st and the 3rd oryctocoenosis (35.3% and 31.3% of all individuals), while the 2nd one is dominated by B.
The best sorting by size is demonstrated by the fossils of the 2nd oryctocoenosis, where the maximum length of bones reaches 56 mm, but 75% of all bones fit within the 1-24 mm range.
Within the 3rd oryctocoenosis 75% of all bones are 1-39 mm long, the maximum length being 154 mm.
Some articulated placoderm skeletal elements are known from the 1st and the 3rd oryctocoenosis, two specimens consisting of several scales of Holoptychius in partial articulation, as well as articulated lower jaws of Holoptychius and
Platycephalichthys, while only separate bones are present in the 2nd oryctocoenosis. Among placoderm remains there are some distal segments of the pectoral fin and incomplete head shields of B.
Taking all macroscopic remains into account, the articulation index in the 1st oryctocoenosis is the highest, reaching 44%, and the same index counted for the head shields of B.
ornata is better represented in the 1st and the 3rd oryctocoenosis than B.