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(1) otsida saab ühe või mitme sõna järgi, tulemustes kuvatakse kirjed, kus vähemalt üks neist on olemas (nt Kaljo Kivimägi);
(2) kui lisad märksõna ette "+" märgi, siis otsitakse vaid kirjeid, kus see märksõna sisaldub (nt +Kaljo +Kivimägi);
(3) märksõna välistamiseks kasuta "-" märki (nt -Kaljo +Kivimägi);
(4) pimeotsingu tähiseks on * (nt litostrat*);
(5) kindla fraasi otsinguks ümbritse see jutumärkidega (nt "tartu riikliku ülikooli");
(6) kombineeri eelnevaid võimalusi (nt +"estonian journal of earth sciences" +Kaljo +year:[2010 TO *] annab tulemuseks kõik Dimitri Kaljo artiklid ajakirjas EJES);

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Detailsem päringuvorm valmib 2020. a teises pooles. Andmete sisestamine ja märksõnadega varustamine kestab 2020. a lõpuni ning seda finantseerib KIKi projekt "Eesti maapõue trükiste andmebaas".

Toom et al., 2020

ViideToom, U., Vinn, O., Isakar, M., Madison, A., Hints, O., 2020: Small faecal pellets in Ordovician shelly fossils from Estonia, Baltoscandia. Estonian Journal of Earth Sciences, 69, 1, 1-19. https://doi.org/10.3176/earth.2020.01
Autor(id)Toom, U., Vinn, O., Isakar, M., Madison, A., Hints, O.
Aasta2020
PealkiriSmall faecal pellets in Ordovician shelly fossils from Estonia, Baltoscandia
Allika tüüpartikkel ajakirjas
AjakiriEstonian Journal of Earth Sciences, 69, 1
Leheküljed1-19
Abstrakt

Coprolites (fossil faeces) constitute a group of soft sediment trace fossils that provide useful palaeoecological and sedimentological information, but have generally low preservational potential. In this paper we report abundant occurrence and high diversity of small faecal pellets preserved inside different shelly fossils from Middle and Upper Ordovician carbonates of the Baltoscandian palaeobasin. The material contains ca 180 body fossils with faecal pellets from 40 localities, corresponding to a range of shallow-marine environments from cool-water carbonate ramp to tropical open shelf settings. Stratigraphically the finds range from the Volkhov to Pirgu regional stages (Dapingian to uppermost Katian). The pellets are elliptical or rod-shaped, 0.1–1.8 mm long and 0.08–0.75 mm in diameter, with the length/diameter ratio ranging from less than 2 to ca 6. They occur in shells of gastropods, bivalves, cephalopods, brachiopods, echinoderms and trilobites and represent two ichnospecies, Coprulus oblongus and Coprulus bacilliformis, and some intermediate forms belonging to the same ichnogenus. Additionally, two compound traces were identified: Tubularina (pellets inside small burrows with circular cross section) and Alcyonidiopsis (pellets inside ribbon-shaped burrows). The pellets were produced when the empty shells were located on the seafloor, or possibly during shallow burial in the oxic zone. The preservation of faecal pellets is due to an interaction of several factors, notably protection by the shells and rapid mineralization. The origin of trace makers remains speculative, but polychaete worms having compatible size and body plan and living representatives who produce similar faecal pellets are among the most likely groups. Possibly organisms with different feeding strategies were involved in producing the faecal pellets. Systematic examination of shelly fossils from selected localities showed that up to about half of the shells may contain pellets, which indicates great abundance and diversity of pellet-producing organisms in the Ordovician Baltoscandian basin. Our material also shows that the trace maker of Arachnostega was not related to the faecal pellets inside the shells.

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DOIhttps://doi.org/10.3176/earth.2020.01
URLhttp://eap.ee/public/Estonian_Journal_of_Earth_Sciences/2020/issue_1/earth-2020-1-1-19.pdf
PDF
Kirje ID15466
Sisestatud, muudetud2019-12-18T14:38:57Z | 2020-04-19T12:40:15Z