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Paleobiology of stromatolite buildin...

Lee, Seong-Joo.

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Paleobiology of stromatolite building microfossils in the Mesoproterozoic Gaoyuzhuang Formation (1.4-1.5 Ga), China.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Paleobiology of stromatolite building microfossils in the Mesoproterozoic Gaoyuzhuang Formation (1.4-1.5 Ga), China./
作者:	Lee, Seong-Joo.
面頁冊數:	174 p.
附註:	Source: Dissertation Abstracts International, Volume: 59-02, Section: B, page: 5790.
Contained By:	Dissertation Abstracts International59-02B.
標題:	Paleontology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9823229
ISBN:	9780591760170

Paleobiology of stromatolite building microfossils in the Mesoproterozoic Gaoyuzhuang Formation (1.4-1.5 Ga), China.
Lee, Seong-Joo.

Paleobiology of stromatolite building microfossils in the Mesoproterozoic Gaoyuzhuang Formation (1.4-1.5 Ga), China. - 174 p.

Source: Dissertation Abstracts International, Volume: 59-02, Section: B, page: 5790.

Thesis (Ph.D.)--Boston University, 1998.

Silicified stratiform stromatolites from the Mesoproterozoic Gaoyuzhuang Formation (1.4-1.5 Ga), China contain well preserved microfossils. In addition to microbiota, the cherts harbor varied synsedimentary precipitates and void-filling cements, now replaced by early diagenetic silica minerals. The depositional environment is interpreted as protected, shallow depressions within intertidal setting with frequent incidents of carbonate precipitation. Early silicification was an essential condition for microfossil preservation. The microfossils were supported by sediment matrix during diagenesis, a condition which contributed to their preservation in the original growth position. Arrangement and orientation of the fossils are correlated with changing depositional events. Four distinct assemblages, two composed of coccoid and two of filamentous (uni- and multi-trichomous) microfossils, were identified as main frame-building biological components of Gaoyuzhuang stromatolites. The coccoids are dominated by Eoentophysalis belcherensis and Coccostratus dispergens, respectively. Less numerous coccoids include: Archaeoellipsoides, Clonophycus, Eosynechococcus, Myxococcoides, Palaeoanacystis, and Sphaeorophycus. The newly discovered coccoid microfossil Archeocalyx erectus n. gen. et sp. which grew epiphytically on fossil filaments represents the earliest documentation of epibiotic interrelationships in the fossil record. Multi-trichomous filamentous fossils were recognized as populations of a biological taxon Eoschizothrix composita n. gen. et sp. of cyanobacterial affinity. Paleontological treatment of sheath materials identified four basic form taxa: Siphonophycus robustum, S. inornatum, S. kestron and S. capitaneum. Trichome-like microfossils include complete filaments of Palaeolyngbya, naked trichomes of Cyanonema, Oscillatoriopsis and Veteronostocale, and hormogone-like short trichomes of Saccolyngbya. Each assemblage of frame-building microfossils responded to sedimentation with different mechanisms to escape burial. High sedimentation rates are found to correlate with scattered colonies of coccoids and loose webs of predominantly upright filaments, low sedimentation rates with dense, laterally connected colonies of coccoids, with filaments changing orientation from vertical to horizontal, and with an increase in number of trichomes per filament. Such changes are consequences of microorganismal behavioral responses in the course of their life cycles. The observed morphological variability is, thus, explained in terms of microbial development, reproduction and behavior. The results are the first record of functional differentiation in ancient microbial mats.

ISBN: 9780591760170Subjects--Topical Terms:

518862
Paleontology.

Paleobiology of stromatolite building microfossils in the Mesoproterozoic Gaoyuzhuang Formation (1.4-1.5 Ga), China.
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520 $a Silicified stratiform stromatolites from the Mesoproterozoic Gaoyuzhuang Formation (1.4-1.5 Ga), China contain well preserved microfossils. In addition to microbiota, the cherts harbor varied synsedimentary precipitates and void-filling cements, now replaced by early diagenetic silica minerals. The depositional environment is interpreted as protected, shallow depressions within intertidal setting with frequent incidents of carbonate precipitation. Early silicification was an essential condition for microfossil preservation. The microfossils were supported by sediment matrix during diagenesis, a condition which contributed to their preservation in the original growth position. Arrangement and orientation of the fossils are correlated with changing depositional events. Four distinct assemblages, two composed of coccoid and two of filamentous (uni- and multi-trichomous) microfossils, were identified as main frame-building biological components of Gaoyuzhuang stromatolites. The coccoids are dominated by Eoentophysalis belcherensis and Coccostratus dispergens, respectively. Less numerous coccoids include: Archaeoellipsoides, Clonophycus, Eosynechococcus, Myxococcoides, Palaeoanacystis, and Sphaeorophycus. The newly discovered coccoid microfossil Archeocalyx erectus n. gen. et sp. which grew epiphytically on fossil filaments represents the earliest documentation of epibiotic interrelationships in the fossil record. Multi-trichomous filamentous fossils were recognized as populations of a biological taxon Eoschizothrix composita n. gen. et sp. of cyanobacterial affinity. Paleontological treatment of sheath materials identified four basic form taxa: Siphonophycus robustum, S. inornatum, S. kestron and S. capitaneum. Trichome-like microfossils include complete filaments of Palaeolyngbya, naked trichomes of Cyanonema, Oscillatoriopsis and Veteronostocale, and hormogone-like short trichomes of Saccolyngbya. Each assemblage of frame-building microfossils responded to sedimentation with different mechanisms to escape burial. High sedimentation rates are found to correlate with scattered colonies of coccoids and loose webs of predominantly upright filaments, low sedimentation rates with dense, laterally connected colonies of coccoids, with filaments changing orientation from vertical to horizontal, and with an increase in number of trichomes per filament. Such changes are consequences of microorganismal behavioral responses in the course of their life cycles. The observed morphological variability is, thus, explained in terms of microbial development, reproduction and behavior. The results are the first record of functional differentiation in ancient microbial mats.
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