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

 Sessilia - Balanidae
Balanus sp. Da Costa 1778 barnacle
 Arcida - Arcidae
"Anadara trilineata" = Anadara (Anadara) trilineata
"Anadara trilineata" = Anadara (Anadara) trilineata Conrad 1856 ark
 Pectinida - Pectinoidae
"Chlamys parmeleei" = Swiftopecten parmeleei Dall 1898 scallop
 Cardiida - Mactridae
"Spisula hemphilli" = Mactromeris hemphillii, Mactra sp.
"Spisula hemphilli" = Mactromeris hemphillii Dall 1894 clam
Mactra sp. Linnaeus 1767 clam
 Cardiida - Veneridae
"Dosinia ponderosa" = Dosinia (Dosinia) ponderosa Gray 1838 venus clam
 Solenida - Pharidae
Siliqua lucida Conrad 1837 clam
 Lucinida - Thyasiridae
"Thyasira bisecta" = Conchocele conradii
"Thyasira bisecta" = Conchocele conradii Rosenkrantz 1942 clam
 Lucinida - Lucinidae
"Lucinoma annulata" = Lucinoma annulatum
"Lucinoma annulata" = Lucinoma annulatum Reeve 1850 clam
 Neogastropoda - Olividae
"Olivella biplicata" = Olivella (Callianax) biplicata
"Olivella biplicata" = Olivella (Callianax) biplicata Sowerby 1825 olive snail
 Neogastropoda - Cancellariidae
Cancellaria tritonidea Gabb 1866 snail
 Neogastropoda - Muricidae
Thais emarginata murex snail
Nucella lamellosa Gmelin 1791 murex snail
 Calyptraeoidea - Calyptraeidae
 Sorbeoconcha - Prostyliferidae
 Sorbeoconcha - Potamididae
 Sorbeoconcha - Turritellidae
Turritella cooperi Carpenter 1864 turret shell
 Turbinoidea - Turbinidae
Turbo sp. Linnaeus 1758 snail
 Trochoidea - Trochidae
Tegula gallina Forbes 1850 top snail
 Trochoidea - Tegulidae
 Plagiostomi - Squalidae
"Carcharodon megalodon" = Otodus megalodon
"Carcharodon megalodon" = Otodus megalodon Agassiz 1843 megalodon
 Myliobatiformes - Myliobatidae
Myliobatis sp. Cuvier 1816 eagle ray
 Lamniformes - Lamnidae
Isurus plana mako shark
 Carchariniformes - Carcharhinidae
Carcharhinus sp. de Blainville 1816 requiem shark
 Scleractinia - Caryophylliidae
Paracyathus stearnsii Verrill 1869 stony coral