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
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
Echinoidea | |
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Gastropoda | |
Chlorostoma gallina Forbes 1850 top snail | |
"? Leptothyra sp." = Collonista
"? Leptothyra sp." = Collonista Iredale 1918 snail | |
Scaphander sp. Monfort 1810 snail | |
Turritella cf. ocoyana Conrad 1855 turret shell | |
? Crepidula sp. Lamarck 1799 slipper shell | |
"Natica reclusiana" = Glossaulax reclusiana
"Natica reclusiana" = Glossaulax reclusiana Deshayes 1839 moon snail | |
Oliva aff. venulata olive snail | |
"Cuma cf. tecta" = Thais
"Cuma cf. tecta" = Thais murex snail | |
Strombus sp. Linnaeus 1758 conch | |
Ovulum ? sp. Linnaeus 1758 cowry | |
Bivalvia | |
"Mytilus mathewsonii" = Crenomytilus mathewsoni
"Mytilus mathewsonii" = Crenomytilus mathewsoni Gabb 1866 mussel | |
"Pecten crassicardo" = Lyropecten crassicardo
"Pecten crassicardo" = Lyropecten crassicardo Conrad 1856 scallop | |
? Arca sp. Linnaeus 1758 ark | |
"Cardium aff. meekianum" = Clinocardium (Clinocardium) meekianum
"Cardium aff. meekianum" = Clinocardium (Clinocardium) meekianum Gabb 1866 cockle | |
"Psammosolen sp." = Solecurtus
"Psammosolen sp." = Solecurtus Blainville 1824 clam | |
Tellina sp. Linnaeus 1758 tellin clam
Macoma nasuta Conrad 1837 tellin clam | |
Chione undatella Sowerby I 1835 venus clam
Dosinia cf. dunkeri Philippi 1844 venus clam | |
Mactromeris sp. Conrad 1868 clam | |
"Corbula cf. luteola" = Caryocorbula luteola
"Corbula cf. luteola" = Caryocorbula luteola Carpenter 1864 clam | |
"Phacoides nuttalli" = Lucinisca nuttalli
"Phacoides nuttalli" = Lucinisca nuttalli Conrad 1837 clam Subspecies: Phacoides nuttalli var. antecedens
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