Lago Alajuela (Miocene of Panama)

Also known as UF VP YPA088

Where: Panama (9.2° N, 79.6° W: paleocoordinates 9.0° N, 78.2° W)

• coordinate stated in text

When: Alajuela Formation, Tortonian (11.6 - 7.2 Ma)

• Comparison of the mean ratio with the global seawater 87Sr/86Sr curve for the Neogene [13] indicates a late Miocene age of 9.77 ± 0.22 Ma for this por- tion of the Alajuela Formation (Fig 5). The strontium dates also confirm a late Miocene age for the associated vertebrate fossils including the biochronologically informative horses and proboscidean Gomphotherium sp.

Environment/lithology: marine; sandstone

• The Alajuela Formation includes a >25 m-thick basal package of interbedded, clast-supported conglomerates and litharenite sandstones that grades into an ~85 m-thick package of calcareous sandstones and calcarenites, representing a transition from tide-dominated, potentially estuarine, coastal environments to wave-dominated, shallow-water carbonate environments [10,18]. The 82 m-thick composite section (Fig 3), measured in proximity to the fossil localities on the southern extent of Lago Alajuela (Table 1), is subdivided into three distinctive lithological intervals to summarize major facies transitions during this transgression.

Size class: macrofossils

Primary reference: B. J. MacFadden, D. S. Jones, N. A. Jud, J. W. Moreno, G. S. Morgan, R. W. Portell, V. J. Perez, S. M. Moran, and A. R. Wood. 2017. Integrated Chronology, Flora and Faunas, and Paleoecology of the Alajuela Formation, Late Miocene of Panama. PLoS One 12(1):e0170300 [M. Uhen/M. Uhen/M. Uhen]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 187583: authorized by Mark Uhen, entered by Mark Uhen on 02.08.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
Malacostraca
 Decapoda - Callianassidae
Callianassidae indet. Dana 1852 decapod
Maxillopoda
 Sessilia - Balanidae
cf. Tamiosoma sp. Conrad 1856 barnacle
Polychaeta
  -
Polychaeta indet. Grube 1850
Bivalvia
 Arcida - Arcidae
Arcidae indet. Lamarck 1809 clam
 Pectinida - Pectinoidae
Euvola sp. Dall 1898 scallop
Nodipecten sp. Dall 1898 scallop
 Pectinida - Plicatulidae
Plicatula sp. Lamarck 1801 scallop
 Pectinida - Anomiidae
Anomia sp. Linnaeus 1758 jingle
 Ostreida - Ostreidae
Crassostrea sp. Sacco 1897 oyster
 Carditida - Carditidae
Venericardia sp. Lamarck 1801 clam
 Pholadida - Corbulidae
Corbulidae indet. Lamarck 1818 clam
 Cardiida - Gastrochaenidae
Gastrochaenidae indet. Gray 1840 clam
 Cardiida - Veneridae
Chione sp. von Mühlfield 1811 venus clam
Chionopsis sp. Olsson 1932 venus clam
Lirophora sp. Conrad 1863 venus clam
Pitar sp. Römer 1857 venus clam
Macrocallista sp. Meek 1876 venus clam
 Hiatellida - Hiatellidae
Panopea sp. Menard 1807 clam
 Solenida - Pharidae
Ensis sp. Schumacher 1817 clam
 Protobranchia - Yoldiidae
Yoldiidae indet. Habe 1977 clam
Gastropoda
 Cephalaspidea - Haminoeidae
Haminoeidae indet. Pilsbry 1895 snail
 Neogastropoda - Olividae
Oliva sp. Bruguière 1789 olive snail
Olivella sp. Swainson 1831 olive snail
 Neogastropoda - Buccinidae
Cymatophos sp. Pilsbry and Olsson 1941 true whelk
 Neogastropoda - Melongenidae
Melongena sp. Schumacher 1817 snail
 Neogastropoda - Marginellidae
Marginellidae indet. Fleming 1828 margin shell
 Neogastropoda - Turbinellidae
Turbinella sp. Lamarck 1799 snail
 Neogastropoda - Turridae
Turridae indet. Swainson 1840 turrid
 Neogastropoda - Conidae
Conus sp. Linnaeus 1758 cone shell
 Neogastropoda - Terebridae
Terebra sp. Bruguière 1789 auger snail
 Stromboidea - Strombidae
Strombus sp. Linnaeus 1758 conch
 Naticoidea - Naticidae
Naticidae indet. Guilding 1834 moon snail
 Cypraeoidea - Cypraeidae
Cypraeidae indet. Rafinesque 1815 cowry
 Calyptraeoidea - Calyptraeidae
Calyptraea sp. Lamarck 1799 slipper shell
 Xenophoroidea - Xenophoridae
Xenophora sp. Fischer von Waldheim 1807 carrier shell
 Tonnoidea - Tonnidae
Malea sp. Valenciennes 1833 tun shell
 Sorbeoconcha - Turritellidae
Turritellidae indet. Lovén 1847 turret shell
 Sorbeoconcha - Cerithiidae
Cerithiidae indet. Fleming 1822 cerith snail
 Architectonicoidea - Architectonicidae
Architectonicidae indet. Gray 1850 snail
Scaphopoda
  -
Scaphopoda indet. Bronn 1862 tusk shell
Cephalopoda
 Coleoidea -
Coleoidea indet. Bather 1888
Gymnolaemata
 Cheilostomata - Hippoporidridae
Hippoporidra sp. Canu and Bassler 1927
Stenolaemata
 Cyclostomata - Plagioeciidae
Chondrichthyes
 Myliobatiformes - Rhinopteridae
Rhinoptera sp. Cuvier 1829 cownose ray
 Myliobatiformes - Myliobatidae
Myliobatis sp. Cuvier 1816 eagle ray
 Pristiformes - Pristidae
Pristis sp. Linck 1790 sawfish
 Lamniformes - Otodontidae
"Carcharocles megalodon" = Otodus megalodon
"Carcharocles megalodon" = Otodus megalodon Agassiz 1843 megalodon
 Carchariniformes - Carcharhinidae
Negaprion brevirostris Poey 1868 lemon shark
Carcharhinus sp. de Blainville 1816 requiem shark
 Carchariniformes - Sphyrnidae
Sphyrna mokarran hammerhead shark
 Carchariniformes - Hemigaleidae
"Hemipristis serra" = Hemipristis heteropleurus
"Hemipristis serra" = Hemipristis heteropleurus Agassiz 1844 ground shark
Reptilia
 Testudines - Cheloniidae
Cheloniidae indet. Bonaparte 1832 sea turtle
 Testudines - Pantestudinidae
Testudinidae indet. Batsch 1788 turtle
 Testudines - Podocnemidae
Bairdemys sp. Gaffney and Wood 2002 sideneck turtle
n. sp.
Aves
 Aves -
Reptilia
 Crocodylia -
Tomistominae indet. Kalin 1955 crocodilian
Mammalia
 Sirenia - Dugongidae
cf. Dugongidae indet. Gray 1821 dugong
 Perissodactyla - Equidae
Cormohipparion sp. Skinner and MacFadden 1977 hipparionine horse
Dinohippus sp. Quinn 1955 horse
 Ferae -
cf. Carnivora indet. Bowditch 1821 carnivoran
 Proboscidea - Gomphotheriidae
Gomphotherium sp. Burmeister 1837 gomphothere
 Ungulata - Tayassuidae
Tayassuidae indet. Palmer 1897 peccary
Echinoidea
 Clypeasteroida - Clypeasteridae
Clypeaster sp. Lamarck 1801 sand dollar
Monocotyledoneae
 Arecales - Arecaceae
Palmoxylon sp. Schenk 1882
species A & B
Magnoliopsida
 Fabales - Fabaceae
Fabaceae indet. Lindley 1836
 Malpighiales - Phyllanthaceae
 Malvales - Malvaceae
Malvaceae indet. de Jussieu 1789
 Sapindales - Sapindaceae
Sapindaceae indet. de Jussieu 1789