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Main source = Abduazimova, Z.M. (Ed.), 2001. Stratigraphic Dictionary of Uzbekistan. IMR (Institute of Mineral Resources), Tashkent, 580 pp. (In Russian) Translated to English by the GeoGPT group, Zhejiang Lab, Hangzhou, China--see About

Madmon Formation

Madmon Fm

Period:

Devonian

Age Interval:

Lochkovian-Pragian, Z1

Province:
Zarafshan-N.Gissar

Type Locality and Naming

Along the village of Madmon, right bank of the Dzhindary River, Zarafshan-Gissar mountain region, basin of the Kashkadarya River. A.I. Kim, Yu.N. Apekkin in 1971 (470, pp. 10-11). Stratotype on Mount Bursykhirman and in the Zinzilban and Hodja-Kurgan sayams.

Synonym: Madmon Suite, Мадмонская св.

Lithology and Thickness

Gray of various shades (from light to dark gray and black) indistinctly bedded and massive reefogenic limestones with horizons of cross-bedded biomorphic, detrital, porphyritic, and microgranular limestones, often to some extent recrystallized. Lens-shaped bodies of reef limestone breccias are present, which are not consistent in extension. Thickness 1000m.

Lithology Pattern:

Reef limestone

Relationships and Distribution

Lower contact

Madmon Fm overlies dolomitized limestones of the Arg Gr

Upper contact

It is overlain by the Hodjakurgan series (Khodzhakurgan Fm); the upper boundary is clearly traced in the Zinzilban sayam.

Regional extent

Zarafshan-Gissar mountain region, Kashkadar'ya river basin

GeoJSON

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Fossils

Contains stromatoporoids - Parallelostroma multiplexum Bogoj., Araneosustroma fistulosum Less., Actinostroma">Actinostroma perspicuum Pocta; tabulates - Favosites socialis Sok. et Tes., F. admirabilis Dubat., F. nikiforovae Chekh., F. interstinctus Regnel, F. ex gr. nitidus Chap., Pachyfavosites kozlowskii Sok., P. cylindricus Yanet., P. zerawschanicus Kim, Thamnopora pulchra Dubat., Striatopora tschichatschewi Peetz, Pachyhelioplasma ržonsnitskjae Kim; rugosans - Spongophyllum saumaense Shur., Neomphyma originata Soshk., Chavsakia chavsakiensis Lavr., Lyrielasma petchorense (Soshk.), Dendrostella colimnaris (Zelt.), Schlotheimophyllum aborigenum Spassky; brachiopods - Lanceonuonia tarda (Barr.), Spirigerina marginaloides (Nal.), Howelella angustiplicata Kozl., Protathyris praecursor Kozl., Cymostrophia alfa Kulk., Parachonetes verneuili (Barr.), Gypidula dzausensis Larin, Ivdelinia pseudoivdelensis Khod., Clorindina eifliensis (Stein.), Sieberella cf. sieberi Buch., Linguopugnoides vijaicaformis Larin, Cyrtina heteroclita Deff., Plicocyrtina sera Larin; trilobites - Weberopeltis aculeatus (Web.); ostracods - Sulcatella aff. zinchenkoae Pol., Rozhdestvenskajites rozhdestvenskajae (Pol.); Tentaculites - Paranowakia obuti Bouček, Nowakia ex gr. acuarua Richter; conodonts - Eognathodus sulcatus Philip, Ancyrodelloides aff. delta KI. et M., A. omus M. et Mat., Ozarkodina postexcelsa Maws., O. Pandora Murphy. Mat. et Wal., O. euricaensis Kl. et M., O. remscheidensis remscheidensis (Zieg.), Kimognathus alexei Mashk., Eognathodus sulcatus Philip.

Age

Based on paleontological data, the Bursykhirman Horizon (corresponding to Lochkovian) and Kushnovin Horizon (Pridoli) are distinguished within the series (443).

Age Span:

Beginning stage:

Lochkovian

Fraction up in beginning stage:

0.5

Beginning date (Ma):

415.70

Ending stage:

Pragian

Fraction up in the ending stage:

1.0

Ending date (Ma):

410.51

Depositional setting

Depositional pattern:

Additional Information

Compiler:

A.I. Kim – In: GeoGPT translation of: “Abduazimova, Z.M. (Ed.), 2001. Stratigraphic Dictionary of Uzbekistan. IMR (Institute of Mineral Resources), Tashkent, 580 pp. (In Russian)”