Laventan Explained

The Laventan (Spanish; Castilian: Laventense) age is a period of geologic time (13.8 to 11.8 Ma) within the Middle Miocene epoch of the Neogene, used more specifically within the SALMA classification in South America. It follows the Colloncuran and precedes the Mayoan age.^[1]

Etymology

The age is named after the Miocene Lagerstätte La Venta, where a rich biodiversity from the Middle Miocene has been recovered from the Honda Group.

Formations

Formation	Country	Basin	class=unsortable	Notes
Honda Group

Fossil content

Group	Fossils	Formation	Notes
Mammals
	Boreostemma venezolensis
	Neoglyptatelus sincelejanus
Birds	Aramus paludigrus, Galbula hylochoreutes, Hoazinoides magdalenae
	Pygoscelis calderensis, Spheniscus megaramphus, S. urbinai, Pelagornis sp., aff. Thalassarche sp.
	Pelagornis cf. chilensis
Reptiles &<br />amphibians
	Crocodylia sp.
	Bairdemys thalassica
	Barinasuchus arveloi
	Globidentosuchus cf. brachyrostris, Caiman sp., Mourasuchus sp., Purussaurus sp.
Fishes &<br />crustaceans
	Megalodon, Aetobatus arcuatus, Hemipristis serra, Mugil cephalus, Carcharhinus sp., Citharichthys sp., Galeocerdo sp., Rhinoptera sp., Sphyrna sp., Symphurus sp.
Insects	Macroteleia yaguarum, Sycorax peruensis
Flora	Astroniumxylon parabalansae, Piptadenioxylon paraexcelsa, Solanumxylon paranensis

Correlations

The Laventan (13.8 to 11.8 Ma) correlates with:

• NALMA
  • latest Barstovian (15.97-13.65 Ma)^[2]
  • early Clarendonian (13.65-10.3 Ma)^[3]
• Californian ages
  • Luisian (15.5-13.5 Ma)
• ELMA - Astaracian (15.97-11.608 Ma)^[4]
• CPS^[5]
  • Badenian (13.65-12.7 Ma)^[6]
  • Sarmatian (12.7-11.608 Ma)^[7]
• New Zealand stratigraphy - Southland epoch (15.9-10.92 Ma)^[8]
  • Lillburnian (15.1-12.98 Ma)^[9]
  • early Waiauan (12.98-10.92 Ma)^[10]
• Australian ages
  • Bairnsdalian (15.0-10.5 Ma)
• Japanese ages
  • Tozawan (15.97-13.5 Ma)
• NMAC - Tunggurian (13.65-11.1 Ma)^[11]

Laventan correlations in South America

Formation												Map
Basin												align=center rowspan=17
Boreostemma	align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center
Hapalops	align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center
Miocochilius	align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center
Theosodon	align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center
Xenastrapotherium	align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center
	align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center
	align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center
	align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center
Rodents	align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center
Birds	align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center
Terror birds	align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center
Reptiles	align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center
	align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center
	align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center
Insects	align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center
	Fluvial			Fluvio-deltaic		Fluvio-lacustrine		Fluvio-deltaic			Fluvial
Volcanic	Yes

References

Bibliography

Laventan

Honda Group, Colombia

Honda Group, Bolivia

Aisol Formation

Bahía Inglesa Formation

Capadare Formation

Choquecota and Mauri Formations

Cura-Mallín Group

Gran Bajo del Gualicho Formation

Ipururo and Pebas Formations

Paraná Formation

Pisco Formation

Santa Inés Formation

Sincelejo Formation

Socorro and Urumaco Formations

Notes and References

1. Web site: Laventan . The Paleobiology Database . https://web.archive.org/web/20121012163731/http://paleodb.org/cgi-bin/bridge.pl?action=displayInterval&interval_no=726 . 2012-10-12.
2. http://www.fossilworks.org/cgi-bin/bridge.pl?action=displayInterval&interval_no=222 Barstovian
3. http://www.fossilworks.org/cgi-bin/bridge.pl?action=displayInterval&interval_no=221 Clarendonian
4. http://www.fossilworks.org/cgi-bin/bridge.pl?action=displayInterval&interval_no=292 Astaracian
5. http://www.fossilworks.org/cgi-bin/bridge.pl?action=viewTimeScale&scale_no=129 Central Paratethys Stages
6. http://www.fossilworks.org/cgi-bin/bridge.pl?action=displayInterval&interval_no=1046 Badenian
7. http://www.fossilworks.org/cgi-bin/bridge.pl?action=displayInterval&interval_no=1045
8. http://www.fossilworks.org/cgi-bin/bridge.pl?action=displayInterval&interval_no=927 Southland epoch
9. http://www.fossilworks.org/cgi-bin/bridge.pl?action=displayInterval&interval_no=952 Lillburnian
10. http://www.fossilworks.org/cgi-bin/bridge.pl?action=displayInterval&interval_no=951 Waiauan
11. http://www.fossilworks.org/cgi-bin/bridge.pl?action=displayInterval&interval_no=1041 Tunggurian