A late refugium for Classopollis in the Paleocene Lower Wilcox Group along the Texas Gulf Coast

Geology Pub Date : 2024-01-22 DOI:10.1130/g51772.1
Vann Smith, Angela Hessler, Lorena Moscardelli, David Bord, Iulia Olariu, Maria Antonieta Lorente, Evan Sivil, Xiuju Liu
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Abstract

We report a new ecological refugium for the Cheirolepidiaceae family (pollen form genus Classopollis) in the Paleocene Lower Wilcox Group in the Gulf Coast of southeastern Texas based on palynological analysis of four wells. The Cheirolepidiaceae were once thought to have gone extinct at the Cretaceous−Paleogene (K/Pg) boundary or earlier in North America; however, similar ecological refugia for this family in the Paleocene have previously been reported in China, Argentina, and potentially the Rocky Mountains of the United States. The highest relative abundances of Classopollis pollen were found in delta front, lagoon, and shoreface depositional paleoenvironments marked by high mud-fraction Sr/Ba (a geochemical proxy for salinity), and abundances generally increased down section in older Paleocene strata. The high relative abundance of Classopollis pollen in the well samples, the rarity of reworked Mesozoic palynomorphs, the generally good preservation of Classopollis pollen, and the similarity of Classopollis fluorescence spectra to other in situ Paleocene pollen all provide strong evidence for the survival of the Cheirolepidiaceae family in the coastal salt marshes of Texas through at least the late Paleocene.
德克萨斯州海湾沿岸古新世下威尔科克斯群中的晚期Classopollis栖息地
根据对四口水井的古生物学分析,我们报告了德克萨斯州东南部海湾地区古新世下威尔科克斯组中胭脂虫科(花粉形式为Classopollis属)新的生态庇护所。人们曾一度认为,Cheirolepidiaceae 在白垩纪-古新世(K/Pg)边界或更早的时期就在北美灭绝了;然而,以前曾有报道称,在中国、阿根廷以及美国落基山脉可能也有该科在古新世的类似生态避难所。在三角洲前沿、泻湖和海岸表层沉积的古环境中,Classopollis 花粉的相对丰度最高,其特征是泥浆馏分 Sr/Ba(盐度的地球化学替代物)较高,在较老的古新世地层中,丰度普遍向下增加。油井样本中 Classopollis 花粉的相对丰度很高,中生代古动物的再加工很少见,Classopollis 花粉的保存状况总体良好,Classopollis 荧光光谱与其它原位古新世花粉相似,所有这些都提供了强有力的证据,证明至少在晚古新世,Cheirolepidiaceae 科一直生存在得克萨斯州的沿海盐沼中。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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