Arroyo de los Mineros (Eocene of Argentina)

Where: Tierra del Fuego, Argentina (52.9° S, 68.4° W: paleocoordinates 55.3° S, 58.3° W)

• coordinate estimated from map

• local area-level geographic resolution

When: Cullen Formation, Middle Eocene (48.6 - 37.2 Ma)

• The today status of scientific knowledge of dinoflagellates together with the pollen and spore assemblage indicate a stratigraphic range from Lower to Middle Eocene.

• formation-level stratigraphic resolution

Environment/lithology: estuary or bay; lithified, silty, sandy sandstone

• The Cullen Formation is interpreted as an estuarine-deltaic sequence associated with volcanic activity
• The Cullen Formation consists of a sucession of sandy silts and sands with silty intercalations.

Size class: microfossils

Preservation: soft parts, original sporopollenin

Collected by F. Versoorst in 1971

Collection methods: chemical, hydrochloric, hydroflouric

• The stubs of the palynological preparation are housed at the Pb-Palino, Tucumán, Argentina.

Primary reference: R. Zetter, C. C. Hofmann, I. Draxler, J. Durango Cabrera, M. M. Vergel and F. Vervoorst. 1999. A rich Middle Eocene microflora at Arroyo de los Mineros, near Cañadón Beta, NE Tierra del Fuego Province, Argentina. Abhandlungen der Geologischen Bundesanstalt (56)436-460 [C. Jaramillo/C. Jaramillo/M. Uhen]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 169358: authorized by Carlos Jaramillo, entered by Carlos Jaramillo on 20.05.2015

Creative Commons license: CC BY (attribution)

Taxonomic list

• The palynomorph content is characterized by approximately one third dinoflagellate cysts and two thirds pollen and spores. In the latter, the sum of spores make up 24%, the gymnosperm pol- len 28%, and angiosperm pollen 48%,
unclassified
  -
Equisetopsida
 Pinidae - Pinidae
Araucaria sp. de Jussieu 1789
Lycopodiopsida
 Lycopodiales - Lycopodiaceae
Lycopodium sp. Linnaeus 1753 ground pine
Pteridopsida
  -
Ischyosporites sp. Balme 1957
Polypodiopsida
 Cyatheales - Polypodiidae
"Cnemidaria sp." = Cyathea
"Cnemidaria sp." = Cyathea Smith 1793 scaly tree fern
  - Dicksoniaceae
Lophosoria sp. Presl 1847
Ginkgoopsida
 Ephedrales - Ephedraceae
Ephedra sp. Linnaeus 1753 jointfir
Angiospermae
 Sapindales - Sapindaceae
Cupania sp. Linnaeus soapberry
 Malvales - Bombacaceae
Bombax sp. Linnaeus 1753 cotton tree
 Malvales - Sterculiaceae
Sterculiaceae indet. Ventenat 1807
 Malpighiales - Euphorbiaceae
Euphorbiaceae "indet. 1" Jussieu 1789 spurge
Euphorbiaceae "indet. 2" Jussieu 1789 spurge
 Fabales - Fabaceae
Cassia sp. Linnaeus 1753 legume
Margocolporites sp. Ramanajuan 1966 legume
 Fagales -
Nothofagidites fortispinulosus Menendez and Caccavari 1975
N. fortispinulosus tipo 1 y 2
 Rosales - Rosaceae
Rosaceae "indet. 1" Jussieu 1789 rose
Rosaceae "indet. 2" Jussieu 1789 rose
? Rosaceae "indet. 3" Jussieu 1789 rose
Rubus sp. Linnaeus 1753 bramble
Acaena sp. Mutis and Linneaus 1771 rose
Polylepisl? Acaena
Dicotyledoneae
 Myrtales - Myrtaceae
Myrceugenia sp. Berg 1855 myrtle
 Myrtales - Onagraceae
Fuchsia sp. Linnaeus 1753 willowherb
Angiospermae
 Gunnerales - Gunneraceae
Gunnera sp. Linnaeus
 Asterales - Asteraceae
Asteraceae "sp. 1" Berchtold and Presl 1820 daisy
Asteraceae "sp. 2" Berchtold and Presl 1820 daisy
Asteraceae "sp. 3" Berchtold and Presl 1820 daisy
 Apiales - Apiaceae
Apiaceae "indet. 1" Lindley 1836
Apiaceae "indet. 2" Lindley 1836
Apiaceae "indet. 3" Lindley 1836
 Saxifragales - Haloragaceae
Myriophyllum sp. Linnaeus 1753 water milfoil
 Proteales - Proteaceae
Proteacidites "sp. 1" Cookson and Couper 1953
Proteacidites "sp. 2" Cookson and Couper 1953
Proteacidites "sp. 3" Cookson and Couper 1953
Proteacidites "sp. 4" Cookson and Couper 1953
 Coniferales - Podocarpaceae
Dacrydiumites florinii Cookson and Pike 1953 podocarp
Phyllocladidites mawsonii Cookson 1947 podocarp
Podocarpidites marwickii Couper 1953 podocarp
Magnoliopsida
  -
Reboulisporites fuegiensis
  -
Reboulisporites fuegiensis Zamaloa and Romero 1990