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1.
M. Chandra Singh P. Kundal R. A. S. Kushwaha 《Journal of the Geological Society of India》2010,76(6):573-586
Oligocene-Miocene deposits of Bhuban and Boka Bil Formations, Surma Group, Manipur Western Hill consist of well preserved
ichnofossil assemblages. These formations are represented by eight lithofacies such as Massive sandstone (Sm), Rippled marked
argillaceous sandstone (Sr), Wavy laminated sandstone-siltstone-silty shale (Sw), Laminated shale (Fl), Massive mudstone (Fm),
Trough cross-bedded sandstone (St), Lenticular laminated sandstonesiltstonesilty shale (Sll) and Laminated to massive sandstone-siltstone
(Ssc). Fifteen ichnospecies were identified, which further categories into Skolithos, Cruziana, and Skolithos/Cruziana ichnofacies. Overall distribution pattern and behavioural nature of the ichnoassemblage and sedimentological attributes suggests
that the sediments of Bhuban and Boka Bil Formations were deposited under frequent fluctuating sea level, moderate to strong
energy condition, subtidal to lower intertidal environment, rich in organic nutrients. 相似文献
2.
The Neogene-Quaternary sediments well exposed in the Porbandar Basin are characterized by coralline algae. The limestone,
calc-arenites and marls are the dominant lithology of this sequence. The present paper documents ten species of coralline
algae. Among these, the nongeniculate coralline algae are represented by four species and geniculate coralline algae include
six species. The sediments yielding this algal flora range in age from the Lower Miocene to Late Holocene. 相似文献
3.
The management of groundwater poses challenges in basaltic terrain as its availability is not uniform due to the absence of primary porosity. Indiscriminate excessive withdrawal from shallow as well as deep aquifers for meeting increased demand can be higher than natural recharge, causing imbalance in demand and supply and leading to a scarcity condition. An innovative artificial recharge system has been conceived and implemented to augment the groundwater sources at the villages of Saoli and Sastabad in Wardha district of Maharashtra, India. The scheme involves resectioning of a stream bed to achieve a reverse gradient, building a subsurface dam to arrest subsurface flow, and installation of recharge shafts to recharge the deeper aquifers. The paper focuses on analysis of hydrogeological parameters like porosity, specific yield and transmissivity, and on temporal groundwater status. Results indicate that after the construction of the artificial recharge system, a rise of 0.8–2.8 m was recorded in the pre- and post-monsoon groundwater levels in 12 dug wells in the study area; an increase in the yield was also noticed which solved the drinking water and irrigation problems. Spatial analysis was performed using a geographic information system to demarcate the area of influence of the recharge system due to increase in yields of the wells. The study demonstrates efficacy, technical viability and applicability of an innovative artificial recharge system constructed in an area of basaltic terrain prone to water scarcity. 相似文献
4.
Sumedh K. Humane Savita N. Chaurpagar Samaya S. Humane P. Kundal 《Journal of the Geological Society of India》2010,76(1):75-85
A very rich and diversified dasycladalean algal assemblage has been discovered from the Sylhet Limestone Formation (lower-middle
Eocene) of the Bengal Basin of India for the first time. The depositional environments of the Sylhet Limestone Formation have
been discussed based on the presence of the 11 species of the dasycladalean algae belonging to the three families Dasycladaceae
(Cymopolia inflataramosa Segonzac, C. mayaenese Johnson and Kaska, C. paronai Raineri, Cymopolia sp.), Triploporaceae (Dissocladella lunata Segonzac, Dissocladella sp., Jodotella sloveniaensis Deloffre and Radoicic) and Acetabulariaceae (Clypeina socanensis Deloffre and Radoicic, Clypeina sp., Terquemella sp., Neomeris sp.). The lower Eocene Sylhet Limestone Formation revealed predominance of dasycladalean algal assemblage with the halimedacean
and udoteacean algae and rare occurrence of coralline algae. This suggests their luxuriant growth in the open lagoonal to
shelf environment at the depth of 5–6 m in the warm waters. There is a gradual decrease in the dasycladalean species and genera
in the middle Eocene Sylhet Limestone Formation. The predominance of coralline algae associated with the Sporolithon indicates that the limestone of middle Eocene Sylhet Limestone Formation have been deposited at the littoral to shallow,
high energy open shelf marine environments at a depth of about 40–60 m in warm tropical waters. 相似文献
5.
Hydrogeology Journal - Drinking water scarcity in rural parts of central India in basaltic terrain is common. Most of the rural population depends on groundwater sources located in the fractured... 相似文献
6.
Milind P. Kundal 《Journal of the Geological Society of India》2014,83(6):653-656
The present paper records for the first time the bryozoan fragments from 4 m core of the Godhra Formation (early Miocene) and from 4m core and 5 m core of the Chhasra Formation (early middle Miocene) of the Kachchh Offshore Basin, Western India. The Godhra Formation has presence of three bryozoans, viz., ?Crassimarginatella sp., Thalamoporella sp. and Vincularia sp. while the Chhasra Formation has presence of four bryozoans, namely, ?Margaretta sp., Steginoporella sp., ?Thalamoporella sp. and Vincularia sp. 相似文献
7.
Som Nath Kundal 《Arabian Journal of Geosciences》2018,11(16):474
In this paper, two specimens of fossil Mus from the mudstone horizon underlying the geochronologically dated (2.48 Ma) volcanic ash bed/bentonitized tuff bands that straddle across Gauss-Matuyama transition exposed very near the village Barakhetar are described here. Based on molar morphological terminology, the specimens have been identified and tentatively referred to as Mus cf. Mus flynni. The specimens under the study are related to other fossil Mus from the Indian subcontinent in the present work. 相似文献
8.
The present paper documents nine geniculate coralline algal species, namely Arthrocardia cretacica, Calliarthron antiquum, Corallina hayasaki, C. marshallensis, C. prisca, C. typica, Jania mengaudi,
J. sripadaraoi and J. vetus from Neogene-Quaternary sediments of Porbandar area, Saurahtra, Gujarat. Out of nine species, six species namely Arthrocardia cretacica, Calliarthron antiquum, Corallina hayasaki, C. marshallensis, C. prisca and C. typica occur in the Dwarka Formation (lower-middle Miocene), one species Jania sripadaraoi occurs in the Adatiana Member of the Miliolite Formation (early middle-late Pleistocene) and two species namely, Jania mengaudi and J. vetus occur in the Porbandar Calcarenite Member of the Chaya Formation (late Pleistocene-late Holocene). These species indicate
that the Dwarka Formation and the Adatiana Member of the Miliolite Formation were deposited in tropical marine environment
with moderate to low energy conditions at depths ranging from intertidal to 60 m, and that the Porbandar Calcarenite Member
of the Chaya Formation was deposited in a tropical marine environment under moderate to low energy conditions at depths ranging
from 40 m to 60 m. 相似文献
9.
The coralline algae (Rhodophyta) are well preserved in the sediments of the Dwarka Formation in and around Porbandar area,
southwest coast of India. There are few records of the preservation of genicula in the fossil coralline algae. Three algal
fragments with genicula are noted and recorded from the area. 相似文献
10.
Generic distinguishing characteristics and stratigraphic ranges of fossil corallines: An update 总被引:1,自引:0,他引:1
P. Kundal 《Journal of the Geological Society of India》2011,78(6):571-586
Corallines or coralline algae are carbonate secreting and strongly calcified red algae of the order Corallinales of division
Rhodophyta. Architecturally, the corallines have two groups, the nongeniculate and geniculate coralline forms. Corallines
are used as a potential tool for paleoecology, paleoenvironments and paleobathymetry. Coralline algae are builder of porous
and permeable carbonate reservoir rocks for hydrocarbon and reefs rich in hydrocarbon. The old approach, ca. prior to 1977,
of taxonomy of fossil coralline genera has been replaced by the modern approach that established during the last decade using
certain distinguishing features such as arrangement of basal filaments, cell fusions, conceptacle perforations and orientation
of filaments around conceptacles of living corallines. The earliest confirmed fossil record of coralline algae is from the
Hauterivian (Early Cretaceous) and from the Hauterivian to the Pleistocene 9 nongeniculate coralline genera, namely Distichoplax, Lithophyllum, Lithoporella, Lithothamnion, Mesophyllum, Neogoniolithon, Phymatolithon, Spongites and Sporolithon and 7 geniculate genera, viz. Amphiroa, Arthrocardia, Calliarthron, Corallina, Jania, Metagoniolithon and Subterraniphyllum having different stratigraphic ranges are unequivocally known as fossils. After 1977, we do not have a comprehensive publication
giving the generic distinguishing characteristics and stratigraphic ranges of both nongeniculate and geniculate corallines.
The present paper gives an update of distinguishing characteristics of fossil coralline algal genera and their stratigraphic
ranges. 相似文献