Depositional Facies and Palynofacies Provenance of Clastic Deposits: Insight from Paleocene Strata in Southeast Region, Nigeria

Depositional Facies and Palynofacies Provenance Reconstruction of the Upper Cretaceous by Means of Particulate Organic Matter and Clastic Deposits of the Nsukka Formation, Southeastern Nigeria

“…2c) are products of suspension sediment fallout in an anoxic, low-energy, shallow to offshore marine environment (Miall, 2000). It was also noted as a deposited product of settling out from suspension of nes due to quiescence marine setting (Okeke et al, 2023). The shale facies is associated with overwhelming abundant large to medium sized Palynomaceral 2 and palynomaceral 4, few medium to small sized P1 and fragments of P3, dino agellate and high diversity and abundance of pollen and spores obtainable in palynofacies events (Figs.…”

“…Fls facies comprises regular alternation of thin beds of dissimilar lithologies of sandstone, siltstone and shale siliciclastic rocks that are interbedded with obvious sharp contacts. Fls was also reported as rhythmic interbeds of numerous grain size ranges of medium to ne grained sandstone, shale, mud and clay; forming wavy, aser and lenticular bedding structures in addition to parallel laminations (Okeke et al, 2023). The thickness of the beds varies from 50 cm to 1 m in places and were directly overlain and underlain by shale facies or siltstone facies and sandstone.…”

“…FA3 crossbedded sandstone consists of planar and inclined types formed by 2-D and 3-D dunes created by strong unidirectional currents in a high-energy, storm-wave-dominated, upper shoreface setting. Sandstone body thicknesses and variable sedimentary structures is indicative of many environmental processes linked with high-energy uni-and bi-directional current, migration of large ow transverse bedforms, slack water mud drapes and low amplitude migrating mega ripple for low angle cross-beds (Okeke et al, 2023) inherent in the study (Fig. 2a).…”