Abstract
The Mesozoic sediments are well exposed in the Kachchh basin and shows sedimentary breaks in the western part of the Basin. Sedimentation in the Kachchh basin occurred in three distinct phases (1) Pre-Rift, (2) Syn-Rift and (3) Post-Rift. The Syn-rift stage is further divided into Early syn-rift and rift climax stages. The Syn-rift basin Stratigraphy is marked by one major hiatus corresponding to Late Oxfordian. Post rift stage is characterized by another major hiatus corresponding to Tithonian. Although, in the central and eastern part of the basin these important hiatus are present whereas in western part of the basin these breaks/hiatus is completely filled. These sedimentary fills are represented by well exposed and age constrained (1) Umia Ammonite Band, (2) Katesar Member and (3) Ukra Member, sedimentary units. Thus the Mesozoic sediments of Western Kachchh are represented by nearly continuous section from Middle Jurassic to Cretaceous. Ichnologically, fourteen major ichnological events are recorded in entire Mesozoic sections of Western Kachchh. These events are spatially extensive in nature and thus helps in short-distance, intra-basinal stratigraphic correlation of the various sections of the western Kachchh. These ichno events are: (1) Diplocraterion-Arenicolites (2) Astereosoma-Rhizocorallium (3) Zoophycos- Chondrites Assemblage (4) Zoophycos (5) Gastrochaeonolites (6) Zoophycos - Thalassinoides (7) Teichichnus - Fugichnia (8) Polykladichnus - Skolithos - Ophiomorpha (9) Phycodes (10) Fugichnia (11) Gyrophyllite - Diplocraterion (12) Psilonichnus and (13) Teredolite ichno assemblages and (14) Cyclic Bioturbated Horizons. Out of these ichnoevents, five of the ichnoevent serve as important stratigraphic markers; these are (1) Zoophycos for Dhosa Oolite, (2) Teichichnus -Fugichnia Event for Middle Jhuran Shales (3) Phycodes horizon for demarcating Upper member and Katesar member boundary, (4) Cyclic bioturbated Horizons for Lower part of Ghuneri Member (5) Teredolite for differentiating base of the Ukra Member with upper part of Ghuneri Mb. Ichno-events like Chondrites - Zoophycos Assemblage; Zoophycos assemblage; Gyrophyllite - Diplocraterion assemblage; Psilonichnus assemblage are useful in reconstructing paleooceanographic conditions of the entire Kachchh basin.
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