Sekurau (Miocene of Indonesia)

Where: Borneo, Indonesia (0.7° N, 117.8° E: paleocoordinates 0.8° N, 118.3° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Late/Upper Miocene (11.6 - 5.3 Ma)

• these beds may involve part of the Upper Sangkulirang Marls and Menubar Marls

• group of beds-level stratigraphic resolution

Environment/lithology: marine; limestone and poorly lithified, shelly/skeletal, sandy, calcareous claystone

• ...light-coloured, massive to well-bedded clays and clay shales between limestone layers, the former often with a coaly admixture and with subordinate sandstones or calcareous sandstones. At many places the sandy-clayey deposits proved to contain a molluscan fauna (some of the shells are filled with fine-grained, sandy material).

•JA: I'm scoring this as poorly lithified based on all the above

Size class: macrofossils

Collection methods: collected by M. Schmidt in 1902, specimens housed at the Rijkmuseum van Geologie en Mineralogie

Primary reference: C. Beets. 1984. Preangerian (Late Miocene) Mollusca from a hill near Sekurau, northern Kutai, Kalimantan Timur (East Borneo). Scripta Geologica 74:1-37 [J. Alroy/E. Leckey/E. Leckey]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 42311: authorized by John Alroy, entered by Erin Leckey on 27.07.2004, edited by Austin Hendy

Creative Commons license: CC BY (attribution)

Taxonomic list

Gastropoda
 Trochoidea - Turbinidae
 Cerithioidea - Cerithiidae
 Cerithioidea - Turritellidae
"Turritella cingulifera" = Turritella (Kurosioia) cingulifera Sowerby 1825 turret shell
 Sorbeoconcha - Strombidae
Strombus sp. Linnaeus 1758 conch
 Sorbeoconcha - Rostellariidae
"Rimella (Dientomochilus) javana" = Varicospira javana
"Rimella (Dientomochilus) javana" = Varicospira javana Martin 1879 snail
 Neogastropoda - Mitridae
 Neogastropoda - Olividae
Ancilla (Sparella) cinnamomea Lamarck 1801 olive snail
 Neogastropoda - Ancillariidae
"Ancilla (Baryspira) schmidti n. sp." = Amalda (Baryspira)
"Ancilla (Baryspira) schmidti n. sp." = Amalda (Baryspira) snail
 Neogastropoda - Nassariidae
"Alectrion (Zeuxis) siquijorensis" = Nassarius (Alectrion), Alectrion (Zeuxis) ovum
"Alectrion (Zeuxis) siquijorensis" = Nassarius (Alectrion) snail
Alectrion (Zeuxis) ovum Martin 1879 snail
 Neogastropoda - Fasciolariidae
? Buccinofusus sp. Conrad 1868 snail
 Neogastropoda - Clavatulidae
Turricula (Turricula) javana snail
T. T. javana tegalensis
 Neogastropoda - Conidae
"Conus vimineus" = Conasprella (Fusiconus) vimineus Reeve 1849 cone shell
 Neogastropoda - Drilliidae
Clathrodrillia sp. Dall 1918 snail
 Neogastropoda - Borsoniidae
Microdrillia sp. Casey 1903 snail
 Neogastropoda - Mangeliidae
Cythara sp. Schumacher 1817 snail
 Neogastropoda - Terebridae
 Neogastropoda - Turridae
Lophiotoma brevicaudata, "Maoritomella batjanensis" = Tomopleura (Maoritomella)
"Maoritomella batjanensis" = Tomopleura (Maoritomella) turrid
 Neogastropoda - Costellariidae
 Neogastropoda - Marginellidae
"Marginella (Eratoidea) vultuosa n. sp." = Eratoidea, "Marginella (Cryptospira) aff. elegans" = Cryptospira, ? Marginella sp.
"Marginella (Eratoidea) vultuosa n. sp." = Eratoidea margin shell
"Marginella (Cryptospira) aff. elegans" = Cryptospira margin shell
? Marginella sp. Lamarck 1799 margin shell
 Neogastropoda - Muricidae
Murex (Murex) djarianensis Martin 1895 murex snail
 Neogastropoda - Volutidae
? Cymbiola sp. Swainson 1831 volute
 Sorbeoconcha - Cassidae
"Phalium (Semicassis) bisulcatum" = Semicassis bisulcata
"Phalium (Semicassis) bisulcatum" = Semicassis bisulcata Schubert and Wagner 1829 snail
 Sorbeoconcha - Naticidae
Natica helvacea Lamarck 1822 moon snail
"Notocochlis gualteriana" = Natica gualteriana Récluz 1843 moon snail
Bivalvia
 Arcida - Arcidae
Anadara sp. Gray 1847 ark
Anadara ferruginea Reeve 1844 rusty ark
lots of valves
Anadara (Anadara) antiquata Linnaeus 1758 ark
 Pectinida - Anomiidae
Anomia (Anomia) cf. verbeeki Martin 1881 jingle
 Pectinida - Placunidae
"Placuna (Placuna) ephippium" = Placuna (Ephippium) ephippium, "Placuna (Placuna) quadrangula" = Placuna (Ephippium) ephippium
"Placuna (Placuna) ephippium" = Placuna (Ephippium) ephippium Philipsson 1788 scallop
"Placuna (Placuna) quadrangula" = Placuna (Ephippium) ephippium Philipsson 1788 scallop
 Pectinida - Pectinoidae
"Chlamys senatoria" = Mimachlamys senatoria, "Amussium hulshofi" = Amusium hulshofi
"Chlamys senatoria" = Mimachlamys senatoria Gmelin 1791 scallop
fragmentary valve
"Amussium hulshofi" = Amusium hulshofi Martin 1883 scallop
a few fragments
 Ostreida - Ostreidae
Ostrea sp. Linnaeus 1758 oyster
a few juvenile valves
 Lucinida - Lucinidae
"Lucina" sp. Bruguière 1797 clam
 Pholadida - Corbulidae
"Corbula taitensis" = Corbula (Anisocorbula) taitensis Lamarck 1818 clam
C. taitensis acuticosta
"Corbula tjiguhanensis" = Corbula (Bicorbula) tjiguhanensis Martin 1922 clam
 Cardiida - Veneridae
Circe (Circe) scripta Linnaeus 1758 Script Venus
a few fragments and damaged valves
Placamen isabellina venus clam
some well preserved valves
 Cardiida - Ungulinidae
 Cardiida - Solecurtidae
 Cardiida - Psammobiidae
"Gari" sp. Schumacher 1817 clam
 Nuculanida - Sareptidae
Scaphopoda
 Dentaliida - Dentaliidae
Dentalium sp. Linnaeus 1758 tusk shell
Dentalium (Dentalium) javanum tusk shell
D. D. javanum tutongense (n. subsp.)