Locality 28, Arroyo Liebre - Beal (1948) (Miocene to of Mexico)

Also known as Loc. 28

Where: Baja California Sur, Mexico (24.6° N, 112.0° W: paleocoordinates 21.8° N, 102.5° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Ysidro Formation, Early/Lower Miocene to Early/Lower Miocene (23.0 - 11.6 Ma)

• The Ysidro Formation consists of dirty-white sandstone, underlying the Comondu Formation. The formation varies in lithology from place to place and apparently becomes more tuffaceous towards the gulf coast. The formation can be subdivided into two members, a lower shale member and an upper sandstone member.

• bed-level stratigraphic resolution

Environment/lithology: coastal; lithified, white sandstone

• Shallow marine assemblage. No specific paleoenvironmental data presented.
• Dirty white sandstone.

Size class: macrofossils

Preservation: mold/impression

Collection methods: quarrying,

• Collections made. No known repository.

Primary reference: C. H. Beal. 1948. Reconnaissance of the geology and oil possibilities of Baja California, Mexico. Geological Society of America Memoir 31 [A. Miller/A. Hendy/A. Hendy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 43809: authorized by Austin Hendy, entered by Austin Hendy on 26.08.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Representative.
Gastropoda
 Trochoidea - Turbinidae
"? Leptothyra sp." = Collonista
"? Leptothyra sp." = Collonista Iredale 1918 snail
 Trochoidea - Trochidae
Chlorostoma gallina Forbes 1850 top snail
 Neotaenioglossa - Calyptraeidae
? Crepidula sp. Lamarck 1799 slipper shell
 Cerithioidea - Turritellidae
Turritella cf. ocoyana Conrad 1855 turret shell
 Sorbeoconcha - Strombidae
Strombus sp. Linnaeus 1758 conch
 Neogastropoda - Olividae
 Neogastropoda - Muricidae
"Cuma cf. tecta" = Thais
"Cuma cf. tecta" = Thais murex snail
 Sorbeoconcha - Cypraeidae
Ovulum ? sp. Linnaeus 1758 cowry
 Sorbeoconcha - Naticidae
"Natica reclusiana" = Glossaulax reclusiana
"Natica reclusiana" = Glossaulax reclusiana Deshayes 1839 moon snail
 Opisthobranchia - Cylichnidae
Scaphander sp. Monfort 1810 snail
Bivalvia
 Arcida - Arcidae
? Arca sp. Linnaeus 1758 ark
 Pectinida - Pectinoidae
"Pecten crassicardo" = Lyropecten crassicardo
"Pecten crassicardo" = Lyropecten crassicardo Conrad 1856 scallop
 Mytilida - Mytilidae
"Mytilus mathewsonii" = Crenomytilus mathewsoni
"Mytilus mathewsonii" = Crenomytilus mathewsoni Gabb 1866 mussel
 Lucinida - Lucinidae
"Phacoides nuttalli" = Lucinisca nuttalli
"Phacoides nuttalli" = Lucinisca nuttalli Conrad 1837 clam
Subspecies: Phacoides nuttalli var. antecedens
 Pholadida - Corbulidae
"Corbula cf. luteola" = Caryocorbula luteola
"Corbula cf. luteola" = Caryocorbula luteola Carpenter 1864 clam
 Cardiida - Veneridae
Dosinia cf. dunkeri Philippi 1844 venus clam
Chione undatella Sowerby I 1835 venus clam
 Cardiida - Mactridae
Mactromeris sp. Conrad 1868 clam
 Cardiida - Cardiidae
"Cardium aff. meekianum" = Clinocardium (Clinocardium) meekianum
"Cardium aff. meekianum" = Clinocardium (Clinocardium) meekianum Gabb 1866 cockle
 Cardiida - Solecurtidae
"Psammosolen sp." = Solecurtus
"Psammosolen sp." = Solecurtus Blainville 1824 clam
 Cardiida - Tellinidae
Tellina sp. Linnaeus 1758 tellin clam
Macoma nasuta Conrad 1837 tellin clam
Echinoidea
 Clypeasteroida - Clypeasteridae
Clypeaster sp. Lamarck 1801 sand dollar
Listed as Clypeaster sp. nov.
 Clypeasteroida - Scutellidae
Scutella ? sp. Lamarck 1816 sand dollar
Listed as "Scutella sp. nov."