A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
Jauhri, A. K.
- Palaeocene Coralline Algal Growth forms and their Significance in the Cauvery Basin, South India
Authors
1 Department of Botany, University of Lucknow, Lucknow -226007, IN
2 Department of Geology, University of Lucknow, Lucknow - 226 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 69, No 6 (2007), Pagination: 1293-1297Abstract
In the present work, we bring out the palaeoenvironmental significance of the growth-form morphology of coralline algae present in the Ninniyur Formation (Palaeocene) of the Cauvery Basin, South India. Our observations indicate presence of four types of coralline algal growth forms in the studied sections of the Ninniyur Formation: laminar, branching, columnar and massive and fragmented. They seem to have been controlled by depositional environments, each characterising a distinctive set of conditions pertaining to water-energy and depth. It appears that the carbonate environment, in which the Ninniyur Formation was deposited, was well differentiated into subenvironments due to changing environmental constraints (depth of deposition and hydraulic energy). The biota responded to these factors through habitat partitioning which possibly hastened the process of evolution of varied types of coralline algal associations and growth morphology leading to distinctive biofacies characters.Keywords
Coralline algae, Growth-forms, Palaeoenvironments, Palaeocene, Cauvery Basin, Tamil Nadu.- Coralline Algae from the Fulra Limestone (Middle Eocene) of Kachchh, Gujarat, Western India
Authors
1 Department of Botany, University of Lucknow, Lucknow - 226 007, IN
2 Department of Geology, University of Lucknow, Lucknow - 226 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 67, No 4 (2006), Pagination: 495-502Abstract
Four species of coralline algae are recognised and described from the Fulra Limestone (middle Eocene). These include Sporolithon sp. 1 Bassi, 1998; Mesophyllum sp.; Phymatolithon sp. Rasser&Piller, 1999 and Melobesioideae gen. et spec. indet. 1. The palaeoecological significance of the recovered algal taxa has been pointed out to indicate the scope of algal flora in palaeoenvironmental studies.Keywords
Coralline Algae, Middle Eocene, Fulra Limestone, Kachchh, Gujarat.- Palaeocene Coralline Algae from the Cauvery Basin, South India
Authors
1 Department of Botany, University of Lucknow, Lucknow - 226 007, IN
2 Department of Geology, University of Lucknow, Lucknow - 226 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 68, No 5 (2006), Pagination: 789-796Abstract
The present paper deals with new records of the seven coralline algae of the Ninniyur Formation which is considered to range from the Danian to Thanetian in age. All these seven species, i e Spongia sp 2 Rasser&Pillar 1999, Lithothamnion graham, Mesophyllum obsitum, Mesophyllum koritzae, Leptophyllum leave, Lithophyllum sp Johnson&Kaska, 1965, Ascophyllum paraphylloides are reported for the first time from the Indian successions, their palaeogeographrc and palaeoecological significance is discussed.Keywords
Coralline Algae, Ninniyur, Palaeocene, Cauvery Basin, Tamil Nadu.- Rhodophycean Algae from the Lower Cretaceous of the Cauvery Basin, South India
Authors
1 Department of Botany, University of Lucknow, Lucknow - 226 007, IN
2 Department of Geology, University of Lucknow, Lucknow - 226 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 73, No 3 (2009), Pagination: 325-334Abstract
The present paper records eight Rhodophycean taxa from the Kallakudi limestone of the Uttatur Group (Lower Cretaceous) exposed in the quarries at Kallakudi and Olaipadi near Govindarajapatnam of the Cauvery Basin, south India. Of these, four species (Melobesioideae gen. et sp. indet 1, Melobesioideae gen. et sp. indet 2, Lithophyllum alternicellum and Pseudoamphiroa propria) belong to corallinaceae family, one species (Polystrata alba) is assigned to Peyssonneliaceae family, two species (Solenopora urgoniana and Parachaetetes asvapatii) are placed under Solenoporaceae; and one species (Sporolithon sp.) is referable to Sporolithaceae family. Among these, three taxa (Solenopora urgoniana, Lithophyllum alternicellum and Pseudoamphiroa propria) are recorded for the first time from India. The study also includes observations on ultrastructural morphological features of Parachaetetes asvapatii. The observations reveal absence of cell fusions, which confirms its affinities with Solenoporaceae. Palaeoecological data indicate that the assemblage from the sequence at the Kallakudi quarry is characteristic of lagoonal to reefal environment, whereas the Olaipadi quarry sequence near Govindarajapatnam points to 20 m to 30 m deep environment characterized by high - to moderate energy conditions.Keywords
Calcareous Algae, Rhodophyceae, Kallakudi Limestone, Uttatur Group, Early Cretaceous.References
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- Middle Eocene Calcareous Algae from Southwestern Kachchh, Gujarat
Authors
1 Department of Botany, University of Lucknow, Lucknow - 226 007, IN
2 Department of Geology, University of Lucknow, Lucknow - 226 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 75, No 5 (2010), Pagination: 749-759Abstract
The Fulra limestone (middle Eocene) exposed in the areas around Jhadwa and Harudi villages, southwestern, Kachchh reveals presence of a rich assemblage of calcareous algae belonging to the Chlorophyceae and Rhodophyceae along with abundant foraminifera. In the present paper, eight species belonging to eight genera of calcareous algae are described. These include Dissocladella longijangensis, Sporolithon keenani, Corallina crossmanni, Arthrocardia sp. Misra et al. 2001, Lithothamnion ishigakiensis, Melobesioideae gen. et spec. indet. 1, Melobesioideae gen. et spec. indet. 2 and Lithoporella melobesioides. Out of these, one taxon belongs to the family Dasycladaceae. Among the remaining taxa, one taxon to the family Sporolithaceae, three taxa to the family Corallinaceae and three to the family Hapalidiaceae. Two coralline species, Corallina crossmanni and Lithothamnion ishigakiensis, are recorded for the first time from India. Another species (Dissocladella longijangensis), though known from other areas of India, is new to the study area.
The dominant group of the calcareous algal association in the study area is represented by non-geniculate coralline algae comprising Hapalidiaceae, Corallinaceae and Sporolithaceae; the minor component is represented by dasyclads (chlorophyceae). These algal groups, together with their growth-forms (arbosescent, encrusting to fruticose, warty), and the associated foraminifera indicate that the depositional environment of the Fulra limestone ranged from deeper innerto mid-ramp environment (40-80 m) in the upper photic zone.
Keywords
Calcareous Algae, Middle Eocene, Fulra Limestone, Kachchh, Gujarat.- Coralline Algae from the Prang Formation (Middle-Late Eocene) of the Lumshnong Area, Jaintia Hills, Meghalaya
Authors
1 Botany of Department, University of Lucknow, Lucknow - 226 007, IN
2 Department of Geology, University of Lucknow, Lucknow - 226 007, IN
3 Department of Geology, Mizoram University, Aizawl – 796 009, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 78, No 4 (2011), Pagination: 355-364Abstract
The present paper records nine species of coralline algae from the Prang Formation of middle-late Eocene age from the Jaintia Hills, Meghalaya. The algae are associated with the larger foraminifera including Nummulites, Alveolina and Discocyclina throughout the succession. The temporal distribution of algal species indicates that seven species are known from the Eocene. Of the remaining two, one ranges from the Palaeocene to Eocene and the other is Palaeocene in age. The coralline algae and larger foraminifers are differentiated into two associations, the lower one indicating inner-ramp environment of high energy and the upper one showing deposition in relatively calm waters of deeper ramp environment.Keywords
Coralline Algae, Larger Foraminifera, Middle-Late Eocene, Jaintia Hills, Meghalaya.References
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- Coralline Algae from the Aramda Reef Member of the Chaya Formation, Mithapur, Gujarat
Authors
1 Department of Botany, University of Lucknow, Lucknow - 226 007, IN
2 Department of Geology, University of Rajasthan, Jaipur - 302 055, IN
3 Department of Geology, University of Lucknow, Lucknow - 226 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 80, No 2 (2012), Pagination: 215-230Abstract
The Quaternary sediments of the Aramda Reef Member of the Chaya Formation exposed in the Mojap coast near Mithapur, Gujarat are characterized by well-developed coralline algal build-ups. These algal build-ups are exceptionally rich in coralline algae and corals. In the present paper, thirteen species belonging to eight genera of coralline algae are described. Out of these, seven species (Titanoderma nataliae, Lithophyllum nitorum, Lithophyllum quadratum, Spongites sp. Brandano et al., 2005, Sporolithon lvovicum, Mesophyllum fructiferum and Lithothamnion praefruticulosum) are the new records for India. Four species (Titanoderma pustulatum, Sporolithon intermedium, Mesophyllum commune and Phymatolithon sp.) are first time recorded from the study area. Among the major framework builders of coralline algae of the Aramda Reef Member are Lithophyllum, Titanoderma, Sporolithon, Mesophyllum and Lithothamnion.
Two associations of the coralline algal assemblages can be distinguished: one indicating shallow water, high-energy conditions is developed in the upper part, while the other suggesting deposition in low-energy conditions is characteristic of the lower part of the succession. These algal associations, together with their growth-forms (encrusting, warty to fruticose, layered) come from stratigraphically separate beds. They indicate that the temperature, depth and hydrodynamic energy conditions also fluctuated during deposition of the Aramda Reef Member. It is concluded that the lower Hapalidiaceae-Sporolithaceae association dominated during warmer interval, whereas the upper lithophylloids association flourished in relatively low-temperature conditions. The associated corals indicate that minimum winter sea surface temperature remained above 18°-20° C.
Keywords
Coralline Algae, Aramda Reef Member, Chaya Formation, Mojap, Gujarat.References
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