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Ratite eggshells from lanzarote, canary islands.

E G Franz Sauer, P Rothe

    Science (New York, N.Y.)
    |April 7, 1972
    PubMed
    Summary
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    Large, extinct flightless birds, including struthious and aepyornithoid types, inhabited Lanzarote until 12 million years ago. Evidence suggests continental crust underlies the Canary Islands, possibly connected to Africa via rifting in the Pliocene.

    Area of Science:

    • Paleontology
    • Geology
    • Island Biogeography

    Background:

    • The Canary Islands' geological history and potential connections to mainland Africa are subjects of ongoing research.
    • Understanding the archipelago's past environments is crucial for reconstructing its unique biodiversity.

    Purpose of the Study:

    • To investigate the presence of extinct avifauna on Lanzarote.
    • To determine the geological underpinnings of the eastern Canary Islands.
    • To explore potential land connections between the Canaries and Africa.

    Main Methods:

    • Analysis of fossilized eggshells (struthious and aepyornithoid) found in Tertiary calcareous sediments.
    • Geological examination of Mesozoic sedimentary rocks in the basement of Lanzarote and Fuerteventura.

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  • Interpretation of sedimentary layers as ancient land surfaces.

    • Main Results:

    • Fossil evidence confirms the existence of large, flightless birds on Lanzarote up to approximately 12 million years ago.
    • Mesozoic sedimentary rocks indicate that continental crust forms the basement of at least part of the Canary Archipelago.
    • A calcarenite horizon was identified as an ancient land surface.

    Conclusions:

    • The eastern Canary Islands are underlain by continental crust, suggesting a geological link to Africa.
    • The separation of the eastern Canaries from Africa may have occurred through rifting.
    • A land bridge might have connected the islands to the mainland during the early Pliocene, facilitating faunal exchange.