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Relationship between algae and environment: an Early Cretaceous case study, Trascau Mountains, Romania

Domenii publicaţii > Ştiinţele pământului şi planetare + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: Bucur Ioan I. & Sasaran Emanoil

Editorial: Springer-Verlag, Facies, 51, p.274-286, 2005.


The relationship between algae and depositional
environment was studied in a limestone succession of
Berriasian–Valanginian age. Several depositional environments
were recorded from shallow subtidal to intertidal
and supratidal, with salinity ranging from normal marine
to fresh and/or supersaline water. The algal assemblages
consist mainly of dasycladaleans, rivulariacean-type
cyanobacteria and charophytes. Nipponophycus (Bryopsydales)
and Lithocodium-Bacinella (microproblematicum),
occur at some levels. Dasycladaleans are associated
with subtidal, sometimes restricted (“lagoonal”) environments,
while rivulariacean-like cyanobacteria and
charophytes characterise intertidal-supratidal and fresh
and/or supersaline environments, respectively. Among the
dasycladaleans, Salpingoporella annulata is often related
to restricted environments where it forms monospecific assemblages.
Large dasycladaleans, such as Selliporella neocomiensis,
Macroporella praturloni and Pseudocymopolia
jurassica are found in subtidal high-energy deposits (bioclastic
grainstones). The relationship between environment
and algae, characteristic for each depositional unit, can be
used to interpret the relative sea-level variations.

Cuvinte cheie: Alge calcaroase, paleoecologie, Cretacic inferior, Muntii Apuseni, Romania // Calcareous algae, palaeoecology, Lower Cretaceous, Apuseni Mountains, Romania