La Joya Exit (Pliocene of Mexico)

Also known as SDSNH 3253

Where: Baja California, Mexico (32.5° N, 116.9° W: paleocoordinates 32.3° N, 115.7° W)

When: San Diego Formation, Zanclean (5.3 - 3.6 Ma)

• Age after Boessenecker et al 2019.

Environment/lithology: marine; conglomeratic sandstone

• The lithology of the base of the San Diego Formation in this area is variable, consisting largely of interbedded sandstone and conglomerate units which rest in angular unconformity on the basalts. The conglomerates consist of a reddish-brown matrix-supported, cobble to boulder sandy conglomerate

Size class: macrofossils

Primary reference: J. R. Ashby and J. A. Minch. 1984. The upper Pliocene San Diego Formation and the occurrence of Carcharodon megalodon at La Joya, Tijuana, Baja California, Mexico. In J. A. Minch, J. R. Ashby (eds.), Miocene and Cretaceous Depositional Environments of Northwestern Baja California, Mexico: Pacific Section AAPG Guidebook 54:19-17 [M. Uhen/M. Uhen]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 154115: authorized by Mark Uhen, entered by Mark Uhen on 27.01.2014

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
Anthozoa
 Scleractinia - Caryophylliidae
Paracyathus stearnsii Verrill 1869 stony coral
Gastropoda
 Trochoidea - Turbinidae
Turbo sp. Linnaeus 1758 snail
 Trochoidea - Trochidae
"Tegula gallina" = Chlorostoma gallina, "Tegula funebralis" = Chlorostoma funebrale, Calliostoma kerri
"Tegula gallina" = Chlorostoma gallina Forbes 1850 top snail
"Tegula funebralis" = Chlorostoma funebrale Adams 1855 top snail
Calliostoma kerri Arnold 1909 top snail
 Neotaenioglossa - Calyptraeidae
"Calyptraea mammillaris" = Calyptraea mamillaris
"Calyptraea mammillaris" = Calyptraea mamillaris Broderip 1834 slipper shell
 Cerithioidea - Turritellidae
Turritella cooperi Carpenter 1864 turret shell
 Cerithioidea - Potamididae
"Cerithidea californica" = Cerithideopsis californica
"Cerithidea californica" = Cerithideopsis californica Haldeman 1840 horn snail
 Neogastropoda - Olividae
"Olivella biplicata" = Callianax biplicata
"Olivella biplicata" = Callianax biplicata Sowerby 1825 olive snail
 Neogastropoda - Turridae
Ophiodermella graciosana Arnold 1908 turrid
 Neogastropoda - Muricidae
Nucella lamellosa Gmelin 1791 murex snail
Thais emarginata murex snail
 Neogastropoda - Cancellariidae
"Cancellaria tritonidea" = Euclia tritonidea
"Cancellaria tritonidea" = Euclia tritonidea Gabb 1866 snail
Bivalvia
 Arcida - Arcidae
Anadara trilineata Conrad 1856 ark
 Pectinida - Pectinoidae
"Chlamys parmeleei" = Swiftopecten parmeleei Dall 1898 scallop
 Lucinida - Thyasiridae
"Thyasira bisecta" = Conchocele bisecta
"Thyasira bisecta" = Conchocele bisecta Conrad 1849 clam
 Lucinida - Lucinidae
"Lucinoma annulata" = Lucinoma annulatum
"Lucinoma annulata" = Lucinoma annulatum Reeve 1850 clam
 Cardiida - Veneridae
"Tivela stultorum" = Tivela (Pachydesma) stultorum Mawe 1823 venus clam
"Protothaca tenerrima" = Callithaca tenerrima Carpenter 1857 venus clam
Dosinia ponderosa Gray 1838 venus clam
 Cardiida - Mactridae
"Spisula hemphilli" = Mactromeris hemphillii, Mactra sp.
"Spisula hemphilli" = Mactromeris hemphillii Dall 1894 clam
Mactra sp. Linnaeus 1767 clam
 Solenida - Pharidae
Siliqua lucida Conrad 1837 clam
 Nuculida - Nuculidae
"Acila castrensis" = Acila (Truncacila) castrensis
"Acila castrensis" = Acila (Truncacila) castrensis Hinds 1843 divaricate nutclam
 Nuculanida - Nuculanidae
Saccella taphria Dall 1896 pointed nut clam
Thecostraca
 Balanomorpha - Balanidae
Balanus sp. Da Costa 1778 barnacle
Chondrichthyes
 Myliobatiformes - Myliobatidae
Myliobatis sp. Cuvier 1816 eagle ray
 Carcharhiniformes - Carcharhinidae
Carcharhinus sp. de Blainville 1816 requiem shark
 Lamniformes - Lamnidae
Isurus plana mackerel shark
 Lamniformes - Otodontidae
"Carcharodon megalodon" = Otodus megalodon
"Carcharodon megalodon" = Otodus megalodon Agassiz 1835 megalodon