We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Upper Aptian calcareous algae from Pădurea Craiului (Northern Apuseni Mountains, Romania).
- Authors
Bucur, Ioan I.; Granier, Bruno; Săsăran, Emanoil
- Abstract
A study of calcareous strata previously assigned to the Barremian-Early Aptian interval in the northwestern part of Pădurea Craiului, (Apuseni Mountains), led to the identification of a micropaleontological association indicative of a Late Aptian age. Unequivocal evidence for the Late Aptian assignment of these limestones is the presence throughout the sequence of two orbitolinid species, Mesorbitolina texana (ROEMER) and Mesorbitolina subconcava (LEYMERIE). The most interesting sections are located in the neighbourhood of Subpiatra, where both outcrops and a quarry facilitated detailed analyses. In this area, the Upper Aptian succession consists basically of three types of macrofacies: 1) limestone with rudists; 2) limestone with Bacinella and 3) limestone with corals, each of them showing several types of microfacies. Bacinella structures are the most common feature in the whole succession, irrespective of the macrofacies. This paper focuses on an algal association that was identified in several levels within the succession. Dasycladalean algae are more frequent, and are commonly found in grain-dominated fabrics (mostly grainstone textures), in association with orbitolinid foraminifera and bioclasts of corals, rudists and gastropods. However, a few species are present only in mud-dominated fabrics (i.e. lower-energy intervals). The dasycladalean association from the Upper Aptian deposits of Padurea Craiului is of special interest, for this group registered a dramatic decline at the Lower Aptian/Upper Aptian boundary, as confirmed by the relative scarcity of the Dasycladales in the Upper Aptian carbonate deposits.
- Subjects
PADUREA Craiului Mountains (Romania); ROMANIA; STROMATOLITES; LIMESTONE; FOSSIL dasycladales; FOSSIL algae; CARBONATES
- Publication
Geologia Croatica, 2008, Vol 61, Issue 2/3, p297
- ISSN
1330-030X
- Publication type
Article
- DOI
10.4154/gc.2008.22