PPP# 225 - Isla Payardi [middle Gatun Fm] (Miocene of Panama)

Also known as NMB Loc. 17643

Where: Colon, Panama (9.4° N, 79.8° W: paleocoordinates 9.1° N, 78.5° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: middle Gatun Member (Gatun Formation), Tortonian (11.6 - 7.2 Ma)

• STRATIGRAPHIC RELATIONS: The Gatun Fm rests unconformably on formations of different ages in different parts of the Panama Canal Basin. To the east of Colon, the Gatun Fm rests nonconformably on unamed Cretaceous volcanics. To the west of Colon, including several islands in Lake Gatun, the Gatun Fm rests with angular unconformity on the upper Oligocene Caimito Fm. Locality: Sabanita to Payardi. AGE: Tortonian based on more recent dating (Hendy, 2012). Sr dating for nearby sections indicates an age of approximately 10.5 Ma (Hendy, unpublished data).

• bed-level stratigraphic resolution

Environment/lithology: coastal; unlithified, gray, green siltstone and unlithified, bioturbated sandstone

• ENVIRONMENT: from Collins et al. (1999), open, inner neritic.
• GENERAL LITHOLOGY: The lower 5m of the lower Gatun Formation consists of volcanic conglomerate, with 1-5cm clasts and a tuffaceous, arkoskic matrix, cross-bedded, laminated, tuffaceous siltstone and alternating laminated sandstone and siltstone, mostly deeply weathered. The overlying 40m (Section 1) consists of massive, grey-green, clayey siltstone, with minor claystone and fine sandstone units. zones of densely packed large concretions, pervasive bioturbation, and extensive thalassinoid burrow systems, as well as simple vertical and lateral hash-filled burrows. Shell hash of varying grain size and density is almost ubiquitous, as are units packed with diverse, whole mollusks.

Size class: macrofossils

Reposited in the NMB

Collection methods: bulk, sieve,

• COVERAGE: Exhaustive for gastropoda, bivalvia and scaphopoda. COLLECTORS: unknown (PPP staff) collected 8/21/87. REPOSITORIES: Naturhistorisches Museum Basel (NMB),

Primary reference: L. S. Collins and A. G. Coates. 1999. A paleobiotic survey of Caribbean faunas from the Neogene of the Isthmus of Panama. Bulletins of American Paleontology (357) [A. Miller/A. Hendy/A. Hendy]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 79995: authorized by Austin Hendy, entered by Kate Bulinski on 31.03.2008, edited by Austin Hendy

Creative Commons license: CC BY (attribution)

Taxonomic list

• NOMENCLATURE: modern nomenclature, though only identified to subgenus resolution. IDENTIFIER: presumably identified by J. Jackson, J. Todd, H. Fortunato, and P. Jung.
 Arcida - Arcidae
Anadara (Rasia) sp. Gray 1857 ark
 Arcida - Glycymerididae
Tucetona sp. Iredale 1939 clam
 Pectinida - Pectinoidae
Argopecten sp. Monterosato 1889 calico scallop
Flabellipecten sp. Sacco 1897 scallop
 Ostreida - Gryphaeidae
Hyotissa sp. Stenzel 1971 oyster
 Pholadida - Corbulidae
Caryocorbula sp. Gardner 1926 clam
 Cardiida - Chamidae
Chama sp. Linnaeus 1758 jewel box
Arcinella sp. Schumacher 1817 jewel box
 Cardiida - Veneridae
Lirophora sp. Conrad 1863 venus clam
 Cardiida - Cardiidae
"Trachycardium (Dallocardia) sp." = Dallocardia
"Trachycardium (Dallocardia) sp." = Dallocardia Stewart 1930 cockle
 Ptenoglossa - Epitoniidae
Cirsotrema (Cirsotremopsis) sp. Thiele 1928 wentletrap
 Opisthobranchia - Cylichnidae
Cylichnella sp. Gabb 1873 snail
 Neogastropoda - Olividae
Oliva (Oliva) sp. Bruguière 1789 olive snail
 Neogastropoda - Columbellidae
Strombina (Strombina) sp. Mörch 1858 snail
 Neogastropoda - Buccinidae
Cymatophos sp. Pilsbry and Olsson 1941 true whelk
Solenosteira sp. Dall 1890 true whelk
Antillophos (Antillophos) sp. Woodring 1928 true whelk
Nicema sp. Woodring 1964 true whelk
 Neogastropoda - Nassariidae
Calophos sp. Woodring 1964 snail
 Neogastropoda - Fasciolariidae
Fasciolaria (Fasciolaria) sp. Lamarck 1799 tulip snail
 Neogastropoda - Cancellariidae
Bivetiella dariena Toula 1908 snail
Cancellaria sp. Lamarck 1799 snail
sensu lato
Cancellaria mixta Landau et al. 2012 snail
 Neogastropoda - Mitridae
Subcancilla sp. Olsson and Harbison 1953 mitre shell
 Neogastropoda - Marginellidae
Prunum sp. Swainson 1840 margin shell
 Neogastropoda - Muricidae
Chicoreus (Chicoreus) sp. Montfort 1810 murex snail
Haustellum sp. Schumacher 1817 murex snail
 Neogastropoda - Drilliidae
Clathrodrillia sp. Dall 1918 snail
Hindsiclava sp. Hertlein and Strong 1955 snail
 Neogastropoda - Turridae
Gemmula sp. Weinkauff 1875 turrid
Polystira sp. Woodring 1928 turrid
 Neogastropoda - Conidae
Conus sp. Linnaeus 1758 cone shell
 Neogastropoda - Terebridae
Strioterebrum sp. Sacco 1891 auger snail
Terebra (Panaterebra) sp. Olsson 1967 auger snail
 Stromboidea - Strombidae
Strombus sp. Linnaeus 1758 conch
 Naticoidea - Naticidae
"Natica (Naticarius) sp." = Naticarius, Polinices sp.
"Natica (Naticarius) sp." = Naticarius Dumeril 1806 moon snail
Polinices sp. Monfort 1810 moon snail
 Cypraeoidea - Cypraeidae
Siphocypraea sp. Heilprin 1897 cowry
 Vermetoidea - Vermetidae
Petaloconchus sp. Lea 1843 worm shell
 Calyptraeoidea - Calyptraeidae
Crucibulum (Crucibulum) sp. Schumacher 1817 slipper shell
Crepidula sp. Lamarck 1799 slipper shell
 Tonnoidea - Ranellidae
Monoplex gatunicus Beu 2010 triton shell
 Tonnoidea - Personidae
Distorsio decussata Valenciennes 1832 snail
 Tonnoidea - Tonnidae
Malea ringens Swainson 1822 tun shell
 Sorbeoconcha - Turritellidae
Turritella sp. Lamarck 1799 turret shell
 Architectonicoidea - Architectonicidae
Architectonica sp. Röding 1798 sundial
 Dentaliida - Dentaliidae
Dentalium sp. Linnaeus 1758 tusk shell
sensu lato
 Gadilida - Gadilidae
Cadulus sp. Philippi 1844 tusk shell