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Introduction Miospores are transported towards sedimentary basins not only by the winds but mainly by the hydrographic system
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Position of the Moesian Platform at the Lochkovian.
Hypothesis based on miospores
Philippe SteemansPierre BreuerIskra Lakova
Introduction
• Miospores are produced on the land by plants.
Introduction
• Miospores are transported towards sedimentary basins not only by the winds but mainly by the hydrographic system
Introduction
• During normal conditions 95 % of miospores are transported on a distance of less than 1 Km from the mother plant
1 Km
Introduction
X,000 Km
• In very rare cases, miospores can be transportedon very long distance.
Long-range dispersal: conclusions
• Effective long-range dispersal would seem the exception rather than the rule, especially for the larger miospores.
• If exceptions exist for some isolated miospores, this is much more improbable for complete miospore assemblages.
• Therefore, large oceans, mountains … can be barriers preventing free miospore dispersal
Palaeogeographic reconstruction at the Lochkovian
Avalonia(Belgium) Moesia
(Bulgaria,Romania)
La Gileppe
Gileppe outcrop (Ardenne – Avalonia plate)
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Éch.
EE
M
M
Gileppe outcrop (Ardenne – Avalonia plate)
Emphanisporites micrornatus var.
micrornatus
Emphanisporites micrornatus var. sinuosus
Emphanisporites zavallatus var. gedinniensis
Emphanisporites zavallatus var. zavallatus
20 µm Emphanisporites (Ardenne –
Avalonia plate)
• Diamètre (D)
• Densité de l’ornementation (d)
• Rayon de la marque trilète (RY)
• Largeur des muri (lM)• Nombre de muri/zone de
contact (NM)• Forme des muri (m)
simple biforme
• Forme des ornements
• Longueur des ornements (LO)• Largeur des ornements (lO)• Hauteur de la base (HB)
• Largeur des sutures (lS)
Studied parameters
4 groupes
On the base of 5 parameters (diameter, ornament length …) measured on 133 specimens, a correspondance factor analysis and a hierarchic classification has been made.
2 groupes
Biometric study
Biometric study
E. micrornatus var. micrornatus
E. micrornatus var. sinuosus E. zavallatus var. gedinnienis
E. zavallatus var. zavallatus
Evolution of the Emphanisporites assemblage
with time
Reworking
Hypothèse 1
Hypothèse 2
Phylogenic hypothesis
? ?
Palaeogeographic reconstruction at the Lochkovian
Avalonia(Belgium) Moesia
(Bulgaria,Romanaia)
Boreholes on the Moesian Platform
3
3 : Chilia borehole
Emphanisporites from Moesian platform – Chilia borehole
Kardam and Dalgodeltsi boreholes – Moesian Platform
Palaeogeographic reconstruction at the Lochkovian
BelgiumGermanyUK
E. micrornatus micrornatus var micrornatus
Localities where have been observed the phylogenic lineage
RumaniaBulgaria
Poland
Palaeogeographic reconstruction at the Lochkovian
BelgiumGermanyPolandUK
E. micrornatus var micrornatus Localities where have been observed the phylogenic lineage
RumaniaBulgaria
Poland
Chitinozoans
• Paris
Acritarchs
• Photo
Silurian – Lochkovian migration
E. micrornatus micrornatus var micrornatus
Localities where have been observed the phylogenic lineage
RumaniaBulgaria
Lochkovian - Carboniferous
E. micrornatus micrornatus var micrornatus
Localities where have been observed the phylogenic lineage
RumaniaBulgaria
D
