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Alajuela Formation information


Alajuela Formation
Stratigraphic range: Tortonian
(Earliest Hemphillian or Latest Clarendonian)[1]
9.99–9.55 Ma
PreꞒ
O
S
D
C
P
T
J
K
Pg
N
TypeFormation
Sub-unitsSee text
Underliesalluvium
OverliesCaimito Formation
Area25 km2 (9.7 sq mi)[2]
Thickness>110 m (360 ft) (total)
82 m (269 ft) (composite)
Lithology
PrimarySandstone
OtherLimestone, conglomerate
Location
Coordinates9°12′45″N 79°35′37″W / 9.2124°N 79.5936°W / 9.2124; -79.5936
Approximate paleocoordinates9°00′N 78°12′W / 9.0°N 78.2°W / 9.0; -78.2
RegionPanamá Province
CountryAlajuela Formation Panama
ExtentPanama Basin
Type section
Named forLake Alajuela
Named byWoodring
Year defined1957
Alajuela Formation is located in Panama
Alajuela Formation
Alajuela Formation (Panama)

The Alajuela Formation, originally Alhajuela Formation (Tau),[3] is a Late Miocene (Tortonian, Early Hemphillian or Latest Clarendonian in the NALMA classification) geologic formation in the Panama Canal Zone of central Panama.

The formation overlies the Caimito Formation and comprises sandstones, limestones and conglomerates deposited in a tidal-dominated estuarine to shallow marine environment.

The formation crops out in a small area along the southern and western shores of Lake Alajuela, of which it derives its name, and preserves a rich fossil faunal assemblage of mammals, fish (among which fossil teeth of megalodon), invertebrates and flora. The fauna is of paleontological significance as an insight into the ecosystem of Central America preceding the Great American Biotic Interchange (GABI).

  1. ^ Cite error: The named reference MacFadden2017_p23 was invoked but never defined (see the help page).
  2. ^ Area Calculator
  3. ^ Geologic Map, 1980

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