期刊
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
卷 106, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jsames.2020.103050
关键词
Brachyoxylon; Cheirolepidiaceae; Matasiete formation; Castillo formation; Lower Cretaceous
资金
- ANPCyT from Argentina [PICT 2017-1265]
This study analyzed fossil woods from Matasiete and Castillo Formations for the first time, suggesting they belong to genus Brachyoxylon and related family Cheirolepidiaceae, which may have thrived in semi-arid conditions.
We studied fossil woods from Matasiete and Castillo Formations (Aptian-Albian) for the first time. The woods, preserved in fluvial channel and floodplain deposits, have anatomy consistent with the fossil-genus Brachyoxylon Hollick and Jeffrey. Specimens from Castillo Formation have poorly distinct growth ring boundaries, exclusively uniseriate with a mixed arrangement intertracheary radial pitting, araucarioid cross-field pitting with 3-8 half-bordered pits with oblique aperture, and uniseriate rays. Specimens from Matasiete Formation are poorly preserved and only one could be assigned to Brachyoxylon with reservations. Brachyoxylon is a fossil-genus with a worldwide distribution and related to the fossil family Cheirolepidiaceae, a group of conifers that developed in various environments. However, our study suggests that this family would have prospered in locally semi-arid conditions.
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