Christian Heinrich Pander first described conodonts in 1859, originally thinking they were small fish teeth. Later hypotheses suggested they came from various worm, mollusk, and arthropod groups. By the 1970s, the prevailing hypotheses were that conodonts were related to polychaete worms or chordates. The study examines Late Devonian to Early Carboniferous conodonts from deepwater deposits in the Komi Science Center region. Fieldwork was conducted to collect samples, which were then studied using microscopes. A variety of conodont genera including Polygnathus, Palmatolepis, and Pseudopolygnathus were identified. The objectives were to analyze the conodont fauna, establish a z

1. Institute of Geology
Komi Science Center
Ural Division of the Russian Academy of
Sciences
Late Devonian – Early Carboniferous
conodonts of deepwater deposits
Author Plotitsyn
A.N. Scientific supervisor D.Sc.(Geol.& Min.) Beznosova T.M.
Laboratory of stratigraphy

2. Keywords
Conodonts – конодонты
Deepwater deposits – глубоководные отложения
Agnatha - бесчелюстные
Annelids - кольчатые черви
Nematode worms - круглые черви
Clams - двустворчатые моллюски
Arthropoda - членистоногие
Coelenterates - кишечнополостные
Seaweed - морские водоросли
Logbook - полевой дневник

3. Conodonts – who are they?
Reconstructions of the conodont animal

4. Different conodont
elements
Conodont
assemblage

5. Each organism had a set of morphologically distinct
conodont elements
(A) Dorsal view of the reconstructed, closed apparatus of Novispathodus.(B)
Orientation of the apparatus within the conodont’s head

6. Christian Heinrich Pander (1794–1865),
first researcher of conodonts.
First described by Christian H.
Pander in 1859 from clays near St.
Petersburg, Russia.
He originally thought that they
were a variety of small fish teeth.
Afterwards there were a lot of
different hypotheses concerning
conodonts. For example:
- agnatha;
- annelids;
- nematode worms;
- clams;
- arthropoda;
- coelenterate;
- seaweed;
and etc.
By the early 70s only two
hypotheses were considered to be the
most probable which substantiate the
propinquity between conodonts and
polychaeta worms and chordates.

7. Relevance
Upper Devonian and Lower Carboniferous conodonts are
widespread at the Urals and in the matter of biota abundance and
stratigraphic completeness play a great role for fauna evolution,
patterns cognition, biostratigraphy issues clarification, regional and
international zonal scales correlation and also for bounds delimitation
between Devon and Carbon. At the research area deep facies deposits
are poorly characterized by faunal remains. Conodonts are one of the
main groups of fauna which is suitable for biostratigraphy and
correlation of Upper Devonian and Lower Carboniferous sediments.
Their geographical spread and fast evolution give us an opportunity to
compare researched deep-water sections with standard and basic
different facies sections on a regional, interregional and even
intercontinental level. Conodont sequence creation for this very facial
type of sediments within North Urals region is necessary to determine
the level of regional boundary between Devon and Carbon.

8. The main objective of the research is to
investigate conodonts of the Devonian (Famennian) and
Carboniferous (Tournaisian) deposits. For the objective
achievement the following tasks should be solved:
• Consider systematic composition of the conodont
fauna and conduct biofacial analysis.
• Discover zonal conodont sequence in deepwater
sediments and reveal the location of the bound between
Devon and Carbon.
• Identify the boundaries of regional events and a scope
of a Hangenberg global geological event (HGGE) in
Subpolar and Polar Urals sections.

9. Fieldwork Page from logbook
Carbonate deposits

10. Scanning electron microscope
Binocular microscope
Franke chambers

11. Tectonic map of basin of the river Kozhim
Geological scheme of the middle
reaches of the river Syvyu

12. Conodonts of Syvyu River section
1. Polygnathus - 12 species
and subspecies (Pic. 3, 4, 5,
6, 17, 18, 22, 23, 24, 25, 27)
2. Palmatolepis - 6 species and
subspecies (Pic. 1, 8, 9, 10)
3. Pseudopolygnathus - 4
species (Pic. 13, 21)
4. Bispathodus - 3 species and
subspecies (Pic. 14, 20)
5. Branmehla - 2 species (Pic.
12 и 15)
6. Siphonodella - 2 species
(Pic. 19 и 26)
7. Mehlina -1 species (Pic. 11)
8. Hindeodus - 1 species
9. Pseudognathodus - 1
species
10. Bizignathus - 1 species
(Pic. 7)
11. Rhodalepis - 1 species (Pic.
16)

13. Boundary of the Devonian and Carboniferous systems and stratigraphic
equivalents of Hangenberg shale

14. Thank you for
attention!