Ichnological Analysis of Transgressive Marine Tongue in Prograding Deltaic System: Evidences from Ukra Hill Member, Western Kachchh, India

Desai, Bhawanisingh G.

doi:10.1007/s12594-013-0132-5

Cited by 13 publications

(3 citation statements)

References 24 publications

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“…The Late Cretaceous global sea-level rise led to significant marine transgressions that affected part of western and central India (Acharya and Lahiri 1991;Singh and Mishra 2000;Desai 2013). This led to seawater inundation of large areas of central Indian land, resulting in a shift in depositional conditions from pure continental to marine/marginal marine.…”

Section: Palaeogeographymentioning

confidence: 99%

“…Most of the subcontinents of the supercontinent Gondwanaland were fully or partially submerged at different time intervals during the Late Cretaceous, which led to the formation of shallow epicontinental seas in certain areas. Evidence of Cretaceous sea-level rise in the Indian subcontinent is recorded within thick sedimentary successions of the Cauvery Basin (Nagendra et al 2011(Nagendra et al , 2013, Shillong Basin (Singh and Mishra 2000), Kutch Basin (Desai 2013), Bengal-Assam Basin, parts of the Himalayan fold belt, and the Narmada rift basin in west-central India (Acharya and Lahiri 1991;Banerjee et al 2020).…”

Section: Introductionmentioning

confidence: 99%

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Palaeogeographic reconstruction of a fluvio-marine transitional system in Narmada rift basin, India — Implications on Late Cretaceous global sea-level rise

2020

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Rising sea-levels in tectonically active epicontinental basins often lead to varied depositional settings and palaeogeography, mostly influenced by the net accommodation resulting from mutual interference of the extent and nature of landward encroachment by the sea and the net sedimentation. The Cenomanian Nimar Sandstone Formation, Bagh Group, Narmada rift basin, uniquely portrays the effect of sea-level rise within an intra-cratonic setting and attributes to the corresponding palaeogeographic changes in west-central India. An integrated sedimentological–sequence-stratigraphic study of the broadly fining-upward Nimar Sandstone Formation (thickness ~ 20–30 m) depicts the actual nature of changeover from a fluvial to a marine-dominated transitional depositional setting. Detailed sedimentological study reveals total seventeen facies, grouped in five facies associations, viz., the channel-fill facies association (FA-1), the overbank facies association (FA-2), the fluvial-dominated fluvio-tidal facies association (FA-3), the tide-dominated fluvio-tidal facies association (FA-4), and the shoreface facies association (FA-5). Overall facies architecture indicates a west-to-eastward marine encroachment, resulting in stacking of three distinct palaeo-depositional conditions: (i) an initial fluvial system with channel and overbank, changing into a tide-influenced fluvial bay-head delta in the inner estuary, followed by (ii) marine encroachment leading to a tide-dominated central estuary with inter- to sub-tidal settings, and finally, (iii) with further intense marine encroachments, a wave-reworked open shore condition in the outer estuary zone. The overall fining-up succession with a systematic change from fluvial to marine-dominated depositional systems points to a landward shift of the shoreline, signifying a major transgressive event correlated to the Cenomanian global sea-level rise. Characteristic stratal stacking patterns point to four coarsening- and fining-up hemicycles, embedded within the major transgressive succession. These high-frequency cycles attest to the varied interplay of sedimentation, tectonics and sea-level changes, and the resultant net accommodations. A palaeogeographic model is proposed based on the high-frequency transgressive–regressive hemicycles, which envisages the evolution of the depositional environments in relation to the Cenomanian eustatic rise in the intra-cratonic riftogenic fluvio-marine transitional basinal setup.

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Section: Palaeogeographymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Palaeogeographic reconstruction of a fluvio-marine transitional system in Narmada rift basin, India — Implications on Late Cretaceous global sea-level rise

2020

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“…The Bhuj Formation in western Kachchh is divided into three members: Guneri Member, Ukra Member, and Upper Member (Senses strictos; Biswas, 1993). In Eastern and central Kachchh, the Ukra member is absent and is represented by an unconformity (Desai, 2013). The Guneri member is characterized by cyclic alteration of bioturbated ferruginous bands, shale and sandstone (Desai and Saklani, 2012), while the Upper Member is characterized by thick, massive, coarse-grained, feldspathic sandstone with localized thin beds of kaolinitic shale and/or ferruginous bands.…”

Section: Geology and Sedimentologymentioning

confidence: 99%

Palaeocommunity Dynamics and Behavioral Analysis ofConichnus: Bhuj Formation (Lower Cretaceous),Kachchh-India

Desai

Saklani

2015

Ichnos

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A palaeocommunity of large Conichnus conicus, a conical, cone-in-cone shaped burrow, created by sea anemones, occurs in medium-grained, crossbedded, well-sorted sandstone in the middle part of the Cretaceous Guneri Member of the Bhuj Formation in India. The trace fossil Conichnus is considered to be a common element of the Skolithos ichnofacies and is interpreted to reflect equilibrium movement in response to substrate aggradation. In the present study, three different varieties of Conichnus conicus are distinguished based on morphology and internal fabric. Community dynamics and burrowing behavior are revealed by inter-burrow relationships, burrow initiation levels and sedimentology. Three types of behavior are envisaged: retrusive equilibrium, protrusive equilibrium response, and escape behavior. Palaeocommunity dynamics show that the tracemakers consisted of only adult organisms that initiated burrows during neap tides and are adapted to feed effectively during weak flow conditions. The occurrence of Conichnus palaeocommunity in the Guneri Member indicates the tidal conditions in a fully marine setting. Results presented herein may aid in the understanding of palaeocommunity dynamics in other shallow marine sequences.

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Taphonomic Pathways for the Formation of Bioturbated Cycles in the Early Cretaceous Wave-Dominated Deltaic Environment: Ghuneri Member, Kachchh Basin, India

Desai

Chauhan

2021

Mesozoic Stratigraphy of India

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Ichnological Analysis of Transgressive Marine Tongue in Prograding Deltaic System: Evidences from Ukra Hill Member, Western Kachchh, India

Cited by 13 publications

References 24 publications

Palaeogeographic reconstruction of a fluvio-marine transitional system in Narmada rift basin, India — Implications on Late Cretaceous global sea-level rise

Palaeogeographic reconstruction of a fluvio-marine transitional system in Narmada rift basin, India — Implications on Late Cretaceous global sea-level rise

Palaeocommunity Dynamics and Behavioral Analysis ofConichnus: Bhuj Formation (Lower Cretaceous),Kachchh-India

Taphonomic Pathways for the Formation of Bioturbated Cycles in the Early Cretaceous Wave-Dominated Deltaic Environment: Ghuneri Member, Kachchh Basin, India

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