Earth Science Frontiers ›› 2022, Vol. 29 ›› Issue (3): 381-391.DOI: 10.13745/j.esf.sf.2021.7.23

Previous Articles    

Characterization of the trace fossil Teredolites longissimus (Apectoichnus longissimus) from the Eocene La Meseta Formation, Seymour Island, Antarctic Peninsula

LI Ruoshuang1,2(), LI Quanguo1,2,*()   

  1. 1. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences (Beijing), Beijing 100083, China
    2. School of Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing 100083, China
  • Received:2021-03-17 Revised:2021-04-25 Online:2022-05-25 Published:2022-04-28
  • Contact: LI Quanguo


The ichnogenus Teredolites, produced by wood-boring marine bivalves (Teredinidae or Pholadidae), describes trace assemblage of club-shaped borings in log-ground in marine strata. Teredolites are taphonomically indicative of shallow marine environments, thus they can provide valuable information on the taxonomy and distribution of wood substrates as well as the environmental setting during the burial. This article investigates the trace fossil Teredolites longissimus (Apectoichnus longissimus) discovered in the upper part of the La Meseta Formation of Seymour Island, Antarctic Peninsula. The age of this horizon is constrained in the Late Eocene and the development and distribution features of teredinid body fossils preserved in the wood substrate indicate an incipient stage of infestation. Wood substrate and teredinid body fossils were investigated thoroughly using field emission scanning electron microscope (FESEM) and energy dispersive X-ray spectrometer (EDS). The xylic substrate was identified as Phyllocladoxylon sp. of family Podocarpaceae, which confirmed the existence of Phyllocladoxylon had lasted until the Late Eocene in Seymour Island. Framboidal pyrite was discovered in abundance inside teredinid body fossils, 39.2% of the framboids were above 10 μm in grain size, and the maximum grain size reached 44 μm; the size distribution analysis indicated they were formed under oxic condition, suggesting the paleo-ocean in the Antarctic Peninsula area was oxic at the end of the Eocene.

Key words: Teredolites, Seymour Island, Eocene, La Meseta Formation

CLC Number: