Encrusting bryozoan attached to terrestrial plant leaves from brackish deposits of the Lefipán Formation (Patagonia, Argentina), close to the K/Pg boundary

IF 1.9 3区 地球科学 Q1 GEOLOGY
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Abstract

Cretaceous bryozoans from South America have received limited attention despite their sporadic documentation. The K/Pg boundary has been identified in numerous fossil-rich basins in Patagonia, where bryozoans are frequent components of the faunas. Material recovered from upper Maastrichtian outcrops of the Lefipán Formation in the Cañadón Asfalto Basin (Patagonia, Argentina) includes a unique species of cheilostome bryozoan, Conopeum foliorum n. sp., attached to leaf remains of terrestrial plants and associated with scarce euryhaline bivalves. It likely thrived in a warm climate, shallow, well-lit brackish environment influenced by tides, located along the northwest margin of the Paso del Sapo embayment. Conopeum foliorum n. sp. is currently among the earliest known bryozoans from brackish water environments, and the second oldest documented instance of a bryozoan encrusting leaves of terrestrial plants, representing the first of such finding in South America. Based on our findings and available sedimentological and paleoecological data from previous studies, we interpreted Conopeum foliorum n. sp. as a fast-growing opportunistic taxon displaying euryhaline habits and prone to colonize terrestrial plant leaves deposited in a brackish-water nearshore environment.

莱菲潘地层咸水沉积物(阿根廷巴塔哥尼亚)中附着在陆生植物叶片上的包壳贝类,接近 K/Pg 边界
尽管南美洲的白垩纪双壳类动物有零星的文献记载,但它们受到的关注却很有限。在巴塔哥尼亚众多化石丰富的盆地中,K/Pg 边界已经被确定,在这些盆地中的动物群中,经常出现红足类动物。从 Cañadón Asfalto 盆地(阿根廷巴塔哥尼亚)Lefipán 地层的上马斯特里赫特期露头中发现的材料包括一种独特的螯足类双壳类动物(n. sp.),这种双壳类动物附着在陆生植物的叶片残骸上,并与稀少的极头双壳类动物有关。它很可能生长在一个气候温暖、浅水、光照充足、受潮汐影响的咸水环境中,该环境位于 Paso del Sapo 河口的西北边缘。该物种是目前已知的咸水环境中最早的贝类之一,也是有文献记载的第二古老的贝类包覆陆生植物叶片的实例,是南美洲首次发现此类贝类。根据我们的研究结果以及之前研究中获得的沉积学和古生态学数据,我们将 n. sp.解释为一种快速生长的机会性类群,具有水螅习性,容易在咸水近岸环境中沉积的陆生植物叶片上定居。
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来源期刊
Cretaceous Research
Cretaceous Research 地学-地质学
CiteScore
4.10
自引率
19.00%
发文量
235
审稿时长
12 weeks
期刊介绍: Cretaceous Research provides a forum for the rapid publication of research on all aspects of the Cretaceous Period, including its boundaries with the Jurassic and Palaeogene. Authoritative papers reporting detailed investigations of Cretaceous stratigraphy and palaeontology, studies of regional geology, and reviews of recently published books are complemented by short communications of significant new findings. Papers submitted to Cretaceous Research should place the research in a broad context, with emphasis placed towards our better understanding of the Cretaceous, that are therefore of interest to the diverse, international readership of the journal. Full length papers that focus solely on a local theme or area will not be accepted for publication; authors of short communications are encouraged to discuss how their findings are of relevance to the Cretaceous on a broad scale. Research Areas include: • Regional geology • Stratigraphy and palaeontology • Palaeobiology • Palaeobiogeography • Palaeoceanography • Palaeoclimatology • Evolutionary Palaeoecology • Geochronology • Global events.
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