DACIAN BASIN - GeoEcoMar

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112 Chapter 5. Littoral Sedimentary Environment in the Dacian Basin FIGURE 5.20. Late Sarmatian (s. l.) shell bed (SB) cropping out on the right bank of the Râmnicul Sărat River, north of the village Jitia de Jos (Vrancea County). The pictures A, B and C show the same shell bed at increasing enlargements. D. Shell bed with a smaller amount of matrix. E. Shell bed with largely dominant sandy matrix
5.2. Shoreline sedimentation environment in the Dacian Basin 5.2.4. Biological features of the Bizdidel River littoral deposits The Late Maeotian littoral deposits from the Bizdidel River section (Pucioasa, Dâmboviţa County) have been investigated from sedimentological and micropaleontological viewpoints. The micropaleontological study, carried out through the ostracod analysis, was completed by Radu Olteanu (in Jipa, Olteanu, 2005). The results obtained by Radu Olteanu (Fig. 5.21) are the following: ■ Sample 1 (number of specimens in brackets): Ilyocypris aff bradyi Sars (5), Candona aff compressa Koch (4), Pseudocandona albicans (Brady) (4), Candona danubiana Stanceva (8), Candona sp. 2, Hemicytheria aff. parva Stanceva (2), Chartocythere aff. minor Krstic (3), Cyprideis sp. (11). The ostracod community represents a fresh-water biotope, possibly a littoral plain. The presence of five fresh-water species together with brackish-oligohaline species strongly indicate the confluence of two contemporaneous biotopes, a fluvial-lacustrine one and a basinal one; ■ Sample 2 (number of specimens in brackets): Loxoconcha aspera Olteanu (2), Candona aff dunaviensis Stanceva (3), Cyprideis sp. with tuberculate ornamentation (22 adult and juvenile specimens). The high frequency of the Cypreides taxon together with a species of Loxoconcha and two species of Candona (typologically from the group C. angulata G.W. Muller and C. ex gr. caudata Kaufmann) suggest a fresh-water biotope. The tuberculate ornamentation of Cyprideis and presence of juvenile specimens are suplementary indication on the fresh-water nature of the biotope. The mentioned species are common to the limnic facies (Devoto, 1965); ■ Sample 3: Loxoconcha irregularis Olteanu (1 valve), Candona aff. perrara Stanceva (8 juvenile valves), explosion of Cyprideis (non-tuberculate valves). These Late Maeotian species point to the diminishing of the water salinity; ■ Sample 4 (number of specimens in brackets): Cyprideis sp. (54 adult valves şi 88 juvenile, non-tuberculate valves), Loxoconcha aspera Olteanu (27), Loxoconcha ovala Olteanu (18), Loxoconcha irregularis Olteanu (5), Loxoconcha arabesca Olteanu (3), Chartocythere intima Olteanu (4), Leptocyhere sp. A (ex gr Callistocythere (?) negotini Krstic). The dominance of the Cytheridae and the absence of any fresh-water faunal element indicate a littoral community exclusively brackish; ■ Sample 5: eroded valves of Cyprideis sp. (non-tuberculated specimenes), Candona aff. danubiana (one valve); ■ Sample 6: Loxoconcha aspera (4 adult valves), Loxoconcha irregularis (3), valve de Cyprideis sp. (50 non-tuberculated valves, adult and juvenile specimens). This is a restrictive community with two survived „opportunistic” species characterized by large ecological tolerance. The high frequency of Cyprideis 113
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Dan C. Jipa, Cornel Olariu DACIAN B
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Dedicated to the memory of Prof. Gh
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NATIONAL INSTITUTE OF MARINE GEOLOG
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CONTENTS Foreword and Acknowledgeme
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Contents Chapter 7. The Point Bar F
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FOREwORD AND ACkNOwLEDgEMENTS The s
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PLATE 1. Location of the Dacian Bas
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18 Chapter 1. Dacian Basin. General
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The analysis of the paleogeographic
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42 Chapter 2. Dacian Basin paleogeo
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58 FIGURE 2.14. Paleogeography and
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Page 64 and 65: 62 Chapter 2. Dacian Basin paleogeo
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Page 84 and 85: Sedimentation in the brackish-water
Page 86 and 87: 84 Chapter 4. Dacian Basin Physiogr
Page 96 and 97: 94 Chapter 5. Littoral Sedimentary
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Page 158 and 159: The large and continuous rock expos
Page 160 and 161: 158 Chapter 7. The Point Bar Facies
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162 Chapter 7. The Point Bar Facies
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190 Chapter 8. The Paleoenvironment
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The evolution and architecture of a
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200 Chapter 9. Source-Areas in the
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10.1. SEDIMENT ACCUMULATION AREAS I
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214 Chapter 10. History of the Daci
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230 Chapter 11. From Brackish-Marin
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Ai n s w o r t h r. B., Cr o w l e
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258 References hA m o r, g., et al.
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260 References mA C A r o V iC i, n
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262 References ră d A n, s.C., 200
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264 References VAsilieV, i., Kr iJ
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DACIAN BASIN - GeoEcoMar

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