First report of a Meishucun-type early Cambrian (Stage 2) ichnofauna from the Malyi Karatau area (SE Kazakhstan): Palaeoichnological, palaeoecological and palaeogeographical implications

Weber, Bernd; Steiner, Michael; Evseev, Sergey; Yergaliev, G.

doi:10.1016/j.palaeo.2013.08.021

Cited by 14 publications

(13 citation statements)

References 29 publications

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“…A Guanshanichnus type form has been recorded in the extremely shallow‐marine (lagoon) deposits of the Cambrian Stage 2–Stage 3 upper Karatau Member of the Chulaktau Formation, Lesser Karatau area, SE Kazakhstan (Weber et al . ).…”

Section: Radial To Rosette Ichnofossilsmentioning

confidence: 97%

“…) and probably in Stage 2 (Weber et al . ), the addition of Dactylophycus in the Lower Ordovician (Fillion & Pickerill ) allows maintaining the same ichnodiversity level (7 ichnogenera). By the end of the Ordovician, five (20%) new ichnogenera appeared ( Dactylophycus , Bifasciculus , Clematischnia , Arenituba and Parahaentzschelinia ).…”

Section: Rosette Trace Fossils Through Timementioning

confidence: 99%

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Unravelling Phanerozoic evolution of radial to rosette trace fossils

Muñoz

Mángano

Buatois

2019

LET

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Feeding trace fossils, produced by either deposit or detritus feeders and showing radial to rosetted morphology, are all included in the same architectural category. These radial to rosette ichnofossils are widely recorded worldwide throughout the Phanerozoic and have attracted the attention of numerous ichnologists for decades. Construction of a database summarizing occurrences of radial to rosette trace fossils through the Phanerozoic shows that representatives of this category occurred for the first time during the Fortunian, which accounts for the appearance of at least 12% of the total number of ichnogenera in this category. Overall, 32% of all known rosette ichnogenera resulted from the Cambrian Explosion. A second ichnodiversity increase took place (20%) during the Ordovician. Subsequent to the Great Ordovician Biodiversification Event, this architectural category shows minor fluctuations in ichnodiversity resulting in a long‐term plateau. The apparent decline in ichnodiversity by the end of the Cenozoic could reflect a taphonomic artefact resulting from the difficulties of identifying cumulative trace fossils in highly bioturbated modern sediments. Our data set indicates that several radial to rosette ichnogenera (e.g. Arenituba, Dactylophycus, Gyrophyllites, Phoebichnus, Volkichnium) occurred first in shallow‐marine settings and then migrated to either deeper‐water or marginal‐marine environments, while others (e.g. Asterichnus, Cladichnus, Dactyloidites) apparently first occurred in deep‐sea environments and then migrated to shallower waters.

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Section: Radial To Rosette Ichnofossilsmentioning

confidence: 97%

Section: Rosette Trace Fossils Through Timementioning

confidence: 99%

Unravelling Phanerozoic evolution of radial to rosette trace fossils

Muñoz

Mángano

Buatois

2019

LET

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“…Paleogeographic reconstruction for the PЄ‐Є interval and apparent similarities of ichnofacies and depositional environments place the Kazakh microcontinent in lower to middle latitudes of the Northern Hemisphere (Levashova et al, ; Li et al, ; Weber et al, ). The paleogeographic position of Kazakhstan was most likely in between NW Gondwana, Siberia, Mongolia, and Baltica and thus close to the well‐investigated Yangtze Platform of South China (Weber et al, ). The investigated sections were located in the Karatau basin within a shallow‐marine paleo‐environment with a NE facing paleobasin connected to the open ocean (Eganov et al, ).…”

Section: Location and Sample Descriptionmentioning

confidence: 99%

“…The thereby developed shallow‐water environments provided suitable environments for the typical Early Cambrian phosphorite and carbonate deposits and possibly aided with the rapid spreading of organisms. Many of the former microcontinents and platforms, associated with records of the PЄ‐Є transition, such as paleo‐Kazakhstan, South China, Yangtze Platform, Tarim, Mongolia, and Siberia, were paleogeographically located in close vicinity in a low‐ to middle‐latitude setting connected by the same narrow paleo‐ocean (Levashova et al, ; Li et al, ; McCausland et al, ; McKerrow et al, ; Weber et al, ).…”

Section: Introductionmentioning

confidence: 99%

“…This negative carbon excursion and high 87 Sr/ 86 Sr has also been recognized at two locations of Cambrian Kazakh strata (Gamper, ; A. V. Ilyin, ; Meert et al, ; Ohnemüller, ), implying that paleo‐Kazakhstan was also exposed to globally occurring (weathering‐related) processes. Although the stratigraphy of Kazakh strata is well constrained by fossil and sedimentological records (Dzik, ; Holmer et al, ; Popov et al, ; Weber et al, ), isotope and element concentration data are sparse (A. V. Ilyin, ; Meert et al, ).…”

Section: Introductionmentioning

confidence: 99%

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Radiogenic Sr and Stable C and O Isotopes Across Precambrian‐Cambrian Transition in Marine Carbonatic Phosphorites of Malyi Karatau (Kazakhstan)—Implications for Paleo‐environmental Change

Stammeier

Hippler

Nebel

et al. 2019

Geochem Geophys Geosyst

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The Precambrian‐Cambrian (PЄ‐Є) transition is a unique period in Earth's history known for the “Cambrian Explosion.” Here we present a continuous radiogenic and stable isotope (87Sr/86Sr, δ13CVPDB, carb, and δ18OVPDB, carb) and elemental (including rare earth elements) record across the PЄ‐Є transition, preserved in phosphatic and carbonate shallow‐water deposits from two sections (Koksu and Kyrshabakty) in Kazakhstan. Microstructure, trace, and rare earth elements concentrations reflect near‐primary preservation. δ13CVPDB, carb data (−12.1‰ to 3.3‰) record formation conditions at a time of severe geodynamic changes. Negative δ13CVPDB, carb at the PЄ‐Є boundary resemble the Basal Cambrian Carbon Anomaly. Average δ18OVPDB, carb values of −11.7 ± 3.8‰ are suggested to represent near‐primary signals and can be explained by isotopically lighter past sea water and elevated temperature during precipitation compared to present‐day conditions. Initial 87Sr/86Sr of the carbonate and phosphate fraction are in the range of 0.7086–0.7112 at the Koksu section and 0.7082–0.7136 at the Kyrshabakty section. This is in general agreement with the seawater 87Sr/86Sr evolution during the Early Cambrian. In this study, we present a refined 87Sr/86Sr seawater evolution, highlighting an extreme positive Sr isotope excursion at the PЄ‐Є transition, which is suggested to be indicative for enhanced continental weathering and an increase in nutrient runoff into shallow ocean waters. This extreme geodynamic event may have served as a driving force for enhanced biologic activity in the lead up to the Cambrian Explosion, where phosphatic shallow‐water deposits from Kazakhstan constitute a valuable paleo‐environmental archive.

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Occurrence of the Lower Cambrian anemone-style trace fossils in the Zabuk Formation (Mardin–Derik, SE Turkey)

Hoşgör¹,

Yılmaz

2018

Comptes Rendus Palevol

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First report of a Meishucun-type early Cambrian (Stage 2) ichnofauna from the Malyi Karatau area (SE Kazakhstan): Palaeoichnological, palaeoecological and palaeogeographical implications

Cited by 14 publications

References 29 publications

Unravelling Phanerozoic evolution of radial to rosette trace fossils

Unravelling Phanerozoic evolution of radial to rosette trace fossils

Radiogenic Sr and Stable C and O Isotopes Across Precambrian‐Cambrian Transition in Marine Carbonatic Phosphorites of Malyi Karatau (Kazakhstan)—Implications for Paleo‐environmental Change

Occurrence of the Lower Cambrian anemone-style trace fossils in the Zabuk Formation (Mardin–Derik, SE Turkey)

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