Palynofloral and organic characteristics of a Miocene bog-forest, Kalimantan, Indonesia

Demchuk, Thomas D.; Moore, Tim A.

doi:10.1016/0146-6380(93)90032-7

Cited by 41 publications

(17 citation statements)

References 22 publications

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“…The lycopsid-dominated coal-forming swamp biome of the Carboniferous is a well-known example of a biome that no longer occurs. By contrast, the Miocene swampforest of Borneo is a biome that is still present today, essentially unchanged (Demchuk & Moore 1993).…”

Section: How Do Biomes Change Through Time?mentioning

confidence: 99%

Introduction and synthesis: plant phylogeny and the origin of major biomes

Pennington

Cronk

Richardson³

2004

Phil. Trans. R. Soc. Lond. B

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Phylogenetic trees based upon DNA sequence data, when calibrated with a dimension of time, allow inference of: (i) the pattern of accumulation of lineages through time; (ii) the time of origin of monophyletic groups; (iii) when lineages arrived in different geographical areas; (iv) the time of origin of biome-specific morphologies. This gives a powerful new view of the history of biomes that in many cases is not provided by the incomplete plant fossil record. Dated plant phylogenies for angiosperm families such as Leguminosae (Fabaceae), Melastomataceae sensu stricto, Annonaceae and Rhamnaceae indicate that long-distance, transoceanic dispersal has played an important role in shaping their distributions, and that this can obscure any effect of tectonic history, previously assumed to have been the major cause of their biogeographic patterns. Dispersal from other continents has also been i mportant in the assembly of the Amazonian rainforest flora and the Australian flora. Comparison of dated biogeographic patterns of plants and animals suggests that recent long-distance dispersal might be more prevalent in plants, which has major implications for community assembly and coevolution. Dated plant phylogenies also reveal the role of past environmental changes on the evolution of lineages in species-rich biomes, and show that recent Plio-Pleistocene diversification has contributed substantially to their current species richness. Because of the critical role of fossils and morphological characters in assigning ages to nodes in phylogenetic trees, future studies must include careful morphological consideration of fossils and their extant relatives in a phylogenetic context. Ideal study systems will be based upon DNA sequence data from multiple loci and multiple fossil calibrations. This allows cross-validation both of age estimates from different loci, and from different fossil calibrations. For a more complete view of biome history, future studies should emphasize full taxon sampling in ecologically important groups, and should focus on geographical areas for which few species-level phylogenies are available, such as tropical Africa and Asia. These studies are urgent because understanding the history of biomes can both inform conservation decisions, and help predict the effects of future environmental changes at a time when biodiversity is being impacted on an unprecedented scale.

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Section: How Do Biomes Change Through Time?mentioning

confidence: 99%

Introduction and synthesis: plant phylogeny and the origin of major biomes

Pennington

Cronk

Richardson³

2004

Phil. Trans. R. Soc. Lond. B

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“…On the other hand, fluids may deposit elements closer to both floor or roof stratigraphic units as a result of both chemical (pH, eH, levels of gases) and biological (more decomposed plants) material and hence enrich mineral matter in the lower or upper part of coal seams (e.g. Demchuk and Moore, 1993).…”

Section: Discussionmentioning

confidence: 99%

Neo-mineral formation during artificial coalification of low-ash — mineral free-peat material from tropical Malaysia-potential explanation for low ash coals

Wüst

Bustin

Ross

2008

International Journal of Coal Geology

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“…The palynomorph assemblage as a whole shows strong similarities with those previously identified in the San Jorge Gulf Basin, southern Patagonia, Argentina (Palamarczuk and Barreda, 1998), and especially those from the Mazarredo Subbasin (Barreda and Palamarczuk, 2000), dated as Early Miocene and Latest OligoceneEarly Miocene, respectively. The KR-1 well assemblage is also closely comparable to the Early Miocene interval of coeval tropical-subtropical South American and Asian palynological assemblages (Graham, 1977;Kogbe and Sowunmi, 1980;Demchuk and Moore, 1993). This palynofloral association, the acme (or highest appearance datum, HAD) of some of the few recovered dinoflagellate cysts (Lingulodinium machaerophorum, Polysphaeridium zoharyi, Hystrichokopoma rigaudiase) among the taxa found in the rocks of Miocene age (El-Beialy et al, 2005), and the absence of Eocene and Oligocene forms such as Crassoretitriletes vanraadshooveni, Bombacacidites sp., Operculodinium xanthium, and Thalassiphora pelagica support the assignment of Early Miocene age.…”

Section: Sedimentological Analysismentioning

confidence: 99%

Geochemical characterization and palynological studies of some Agbada Formation deposits of the Niger Delta basin: implications for paleodepositional environments

Adebayo¹,

Akinyemi²,

Madukwe³

et al. 2016

Turkish J Earth Sci

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Forty-two ditch cutting samples of the KR-1 offshore well from depths of 9660 ft to 10,920 ft composited at 90-ft intervals were subjected to sedimentological, micropaleontological, and geochemical analyses using standard procedures and the laser ablationinduced coupled plasma mass spectrometry technique, respectively. Sedimentological analysis revealed the presence of glauconites and the rare occurrence of framboidal pyrites, indicative of deposition in a slightly anoxic marine environment. Palynomorph percentage distribution shows that there are more terrestrially derived miospores (dominated by Zonocostites ramonae (Rhizophora spp.), Psilatricolporites crassus (Tabernaemontana crassa), Acrotichum aureum, and Laevigatosporites sp.) than marine phytoplanktons. Rare occurrence of Globoquadrina venezuelana, Globigerinoides promordius, and Globigerina sp. denotes an Early Miocene age and proximal shelf. These indicate that the main environment of deposition in the KR-1 well is coastal to marginal marine consisting of coastal deltaicinner neritic, made up of tidal channel and shoreface deposits. Geochemical results show that the average concentrations of considered rare earth elements are less than their concentrations in world average shale. Trace metal ratios (such as Th/Cr, Cr/Th, Th/Co, and Cr/ Ni) suggest that the investigated sediments were derived from felsic source rocks. Rare earth element patterns (such as La/Yb, Gd/Yb, La/Sm, and Eu/Eu) and Th data established the felsic composition of the source rocks. Ratios of U/Th, Ni/Co, Cu/Zn, and V/Sc suggest a well-oxygenated bottom water condition. Estimated europium and cerium anomalies of the studied samples suggest an oxidizing environment of deposition. Nonetheless, the ratios of V/Cr suggest a range of environmental conditions. Moreover, ratios of V/(V+Ni) suggest the rare occurrence of suboxic to anoxic environments of deposition.

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Palynofloral and organic characteristics of a Miocene bog-forest, Kalimantan, Indonesia

Cited by 41 publications

References 22 publications

Introduction and synthesis: plant phylogeny and the origin of major biomes

Introduction and synthesis: plant phylogeny and the origin of major biomes

Neo-mineral formation during artificial coalification of low-ash — mineral free-peat material from tropical Malaysia-potential explanation for low ash coals

Geochemical characterization and palynological studies of some Agbada Formation deposits of the Niger Delta basin: implications for paleodepositional environments

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