TF153 Bontang (Miocene to of Indonesia)

Also known as Rainy Section

Where: Indonesia (0.1° N, 117.4° E: paleocoordinates 0.7° N, 119.8° E)

• coordinate stated in text

• outcrop-level geographic resolution

When: Burdigalian to Burdigalian (20.4 - 13.8 Ma)

• this section has been dated at the Burdigalian-Langhian boundary

Environment/lithology: reef, buildup or bioherm; muddy carbonate and argillaceous framestone

• Early Miocene to Middle Miocene deltas prograded rapidly eastwards, contributing to the infilling of the Kutai Basin (Hall & Nichols, 2002). Within this depositional regime, carbonate production took place in proximal delta-front settings contemporaneously with the rapid and near-constant siliciclastic input (Lokier et al., 2009). Miocene carbonates formed as low- and high-relief build-ups and coral carpets on delta-front mouth bars, and on the more distal shelf along the seaward margin of the Mahakam Delta where they are strongly influenced by siliciclastic input throughout their evolution (Wilson, 2005). These carbonates have been interpreted as transitional shelf sediments deposited between deltaic and deep-marine facies (Allen & Chambers, 1998).

Size classes: macrofossils, mesofossils

• scleractinian corals, both platy genera such as Echinopora, Pachyseris and Fungophyllia, and less often branching genera of Acroporidae

Collection methods: bulk, surface (in situ),

• Bryozoans were obtained from bulk samples, collected directly from the outcrop from a framestone containing thin platy and branching corals in a clay matrix, and float samples collected as hand specimens from a pile of platy corals lying adjacent to the exposure.

Primary reference: E. Di Martino and P. D. Taylor. 2014. Miocene Bryozoa from East Kalimantan, Indonesia. Part I: Cyclostomata and 'Anascan' Cheilostomata. Scripta Geologica 146:17-126 [L. Liow/L. Liow]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 173652: authorized by Lee Hsiang Liow, entered by Franziska Franeck on 07.10.2015

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Gymnolaemata
 Cheilostomata - Margarettidae
Margaretta amitabhae n. sp.
Margaretta amitabhae n. sp. Di Martino and Taylor 2015
 Cheilostomata - Vicidae
Vix sp.
Vix sp. Gordon 1988
 Cheilostomata - Microporellidae
Microporella sp.
Microporella sp. Hincks 1877
 Cheilostomata - Adeonidae
Reptadeonella toddi, Adeonellopsis "sp. 1"
Reptadeonella toddi Di Martino and Taylor 2015
Adeonellopsis "sp. 1" MacGillivray 1886
 Cheilostomata - Poricellariidae
Poricellaria sp.
 Cheilostomata - Antroporidae
Antropora granulifera
 Cheilostomata - Onychocellidae
Smittipora sp.
Smittipora sp. Jullien 1882
 Cheilostomata - Cribrilinidae
Antoniettella exigua, Puellina sp.
Antoniettella exigua Di Martino and Taylor 2012
 Cheilostomata - Escharinidae
Bryopesanser sanfilippoae n. sp.
Bryopesanser sanfilippoae n. sp. Di Martino and Taylor 2015