Late Cambrian missing link in macroborer evolution preserved in intraclasts

Jeong Hyun Lee, Suk-Joo Choh, Dong Jin Lee

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Macroborings are known to be rare to absent in middle to late Cambrian successions, the time interval between the end-early Cambrian archaeocyath extinction and the advent of new boring organisms during the mid-late Ordovician (the Ordovician Bioerosion Revolution). The occurrence of macroborings was controlled mainly by hard-substrate availability; archaeocyath reefs and hardgrounds provided synsedimentarily lithified substrates during the early Cambrian and Ordovician, respectively. In this study, we report bioerosion structures from micritic intraclasts of flat-pebble conglomerates in the Hwajeol Formation (Furongian), Taebaeksan Basin, Korea. Two types of macroborings (Trypanites and cf. Gastrochaenolites) are recognized, both of which penetrate micritic clasts and are filled with bioclastic grainstone matrix. Several lines of evidence, including the sharp boundaries and unaltered shapes of macroborings, as well as the occurrence of macroborings penetrating the coating of iron- and/or manganese oxide-coated micritic clasts, indicate that these macroborings formed after the cementation of micritic substrates. The Hwajeol macroborings would have formed on micritic clasts and/or hardgrounds that were eroded and formed flat pebbles. The presence of bioerosion structures within clasts of the Hwajeol flat-pebble conglomerates supports a previous hypothesis that macroborers survived in hardgrounds during the middle to late Cambrian, after the extinction of archaeocyath reefs. In addition, the Hwajeol cf. Gastrochaenolites is the earliest of its kind, implying that there could be more kinds of macroborings hidden within Cambrian flat-pebble conglomerates.

Original languageEnglish
Pages (from-to)137-146
Number of pages10
JournalPalaeogeography, Palaeoclimatology, Palaeoecology
Volume489
DOIs
Publication statusPublished - 2018 Jan 1

Fingerprint

reefs
pebble
extinction
bioerosion
clast
manganese oxides
conglomerate
Ordovician
coatings
Korean Peninsula
substrate
basins
iron
reef
boring organism
organisms
grainstone
manganese oxide
cementation
coating

Keywords

  • Flat-pebble conglomerate
  • Furongian
  • Hwajeol Formation
  • Macroboring
  • Taebaeksan Basin

ASJC Scopus subject areas

  • Oceanography
  • Ecology, Evolution, Behavior and Systematics
  • Earth-Surface Processes
  • Palaeontology

Cite this

Late Cambrian missing link in macroborer evolution preserved in intraclasts. / Lee, Jeong Hyun; Choh, Suk-Joo; Lee, Dong Jin.

In: Palaeogeography, Palaeoclimatology, Palaeoecology, Vol. 489, 01.01.2018, p. 137-146.

Research output: Contribution to journalArticle

@article{06a51666529e4915abd943a08c6a7450,
title = "Late Cambrian missing link in macroborer evolution preserved in intraclasts",
abstract = "Macroborings are known to be rare to absent in middle to late Cambrian successions, the time interval between the end-early Cambrian archaeocyath extinction and the advent of new boring organisms during the mid-late Ordovician (the Ordovician Bioerosion Revolution). The occurrence of macroborings was controlled mainly by hard-substrate availability; archaeocyath reefs and hardgrounds provided synsedimentarily lithified substrates during the early Cambrian and Ordovician, respectively. In this study, we report bioerosion structures from micritic intraclasts of flat-pebble conglomerates in the Hwajeol Formation (Furongian), Taebaeksan Basin, Korea. Two types of macroborings (Trypanites and cf. Gastrochaenolites) are recognized, both of which penetrate micritic clasts and are filled with bioclastic grainstone matrix. Several lines of evidence, including the sharp boundaries and unaltered shapes of macroborings, as well as the occurrence of macroborings penetrating the coating of iron- and/or manganese oxide-coated micritic clasts, indicate that these macroborings formed after the cementation of micritic substrates. The Hwajeol macroborings would have formed on micritic clasts and/or hardgrounds that were eroded and formed flat pebbles. The presence of bioerosion structures within clasts of the Hwajeol flat-pebble conglomerates supports a previous hypothesis that macroborers survived in hardgrounds during the middle to late Cambrian, after the extinction of archaeocyath reefs. In addition, the Hwajeol cf. Gastrochaenolites is the earliest of its kind, implying that there could be more kinds of macroborings hidden within Cambrian flat-pebble conglomerates.",
keywords = "Flat-pebble conglomerate, Furongian, Hwajeol Formation, Macroboring, Taebaeksan Basin",
author = "Lee, {Jeong Hyun} and Suk-Joo Choh and Lee, {Dong Jin}",
year = "2018",
month = "1",
day = "1",
doi = "10.1016/j.palaeo.2017.10.005",
language = "English",
volume = "489",
pages = "137--146",
journal = "Palaeogeography, Palaeoclimatology, Palaeoecology",
issn = "0031-0182",
publisher = "Elsevier",

}

TY - JOUR

T1 - Late Cambrian missing link in macroborer evolution preserved in intraclasts

AU - Lee, Jeong Hyun

AU - Choh, Suk-Joo

AU - Lee, Dong Jin

PY - 2018/1/1

Y1 - 2018/1/1

N2 - Macroborings are known to be rare to absent in middle to late Cambrian successions, the time interval between the end-early Cambrian archaeocyath extinction and the advent of new boring organisms during the mid-late Ordovician (the Ordovician Bioerosion Revolution). The occurrence of macroborings was controlled mainly by hard-substrate availability; archaeocyath reefs and hardgrounds provided synsedimentarily lithified substrates during the early Cambrian and Ordovician, respectively. In this study, we report bioerosion structures from micritic intraclasts of flat-pebble conglomerates in the Hwajeol Formation (Furongian), Taebaeksan Basin, Korea. Two types of macroborings (Trypanites and cf. Gastrochaenolites) are recognized, both of which penetrate micritic clasts and are filled with bioclastic grainstone matrix. Several lines of evidence, including the sharp boundaries and unaltered shapes of macroborings, as well as the occurrence of macroborings penetrating the coating of iron- and/or manganese oxide-coated micritic clasts, indicate that these macroborings formed after the cementation of micritic substrates. The Hwajeol macroborings would have formed on micritic clasts and/or hardgrounds that were eroded and formed flat pebbles. The presence of bioerosion structures within clasts of the Hwajeol flat-pebble conglomerates supports a previous hypothesis that macroborers survived in hardgrounds during the middle to late Cambrian, after the extinction of archaeocyath reefs. In addition, the Hwajeol cf. Gastrochaenolites is the earliest of its kind, implying that there could be more kinds of macroborings hidden within Cambrian flat-pebble conglomerates.

AB - Macroborings are known to be rare to absent in middle to late Cambrian successions, the time interval between the end-early Cambrian archaeocyath extinction and the advent of new boring organisms during the mid-late Ordovician (the Ordovician Bioerosion Revolution). The occurrence of macroborings was controlled mainly by hard-substrate availability; archaeocyath reefs and hardgrounds provided synsedimentarily lithified substrates during the early Cambrian and Ordovician, respectively. In this study, we report bioerosion structures from micritic intraclasts of flat-pebble conglomerates in the Hwajeol Formation (Furongian), Taebaeksan Basin, Korea. Two types of macroborings (Trypanites and cf. Gastrochaenolites) are recognized, both of which penetrate micritic clasts and are filled with bioclastic grainstone matrix. Several lines of evidence, including the sharp boundaries and unaltered shapes of macroborings, as well as the occurrence of macroborings penetrating the coating of iron- and/or manganese oxide-coated micritic clasts, indicate that these macroborings formed after the cementation of micritic substrates. The Hwajeol macroborings would have formed on micritic clasts and/or hardgrounds that were eroded and formed flat pebbles. The presence of bioerosion structures within clasts of the Hwajeol flat-pebble conglomerates supports a previous hypothesis that macroborers survived in hardgrounds during the middle to late Cambrian, after the extinction of archaeocyath reefs. In addition, the Hwajeol cf. Gastrochaenolites is the earliest of its kind, implying that there could be more kinds of macroborings hidden within Cambrian flat-pebble conglomerates.

KW - Flat-pebble conglomerate

KW - Furongian

KW - Hwajeol Formation

KW - Macroboring

KW - Taebaeksan Basin

UR - http://www.scopus.com/inward/record.url?scp=85031714555&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85031714555&partnerID=8YFLogxK

U2 - 10.1016/j.palaeo.2017.10.005

DO - 10.1016/j.palaeo.2017.10.005

M3 - Article

VL - 489

SP - 137

EP - 146

JO - Palaeogeography, Palaeoclimatology, Palaeoecology

JF - Palaeogeography, Palaeoclimatology, Palaeoecology

SN - 0031-0182

ER -