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3.55" Carboniferous Fossil Horsetail (Annularia) Plate - France
This is a gorgeous fossil horsetail (Annularia carinata) from the Late Carboniferous-aged Montceau-les-Mines Lagerstatte of France. This formation is Stephanian Stage in age, or approximately 300 million years old. The stalk measures 3" long and is nicely centered on a rectangular-cut, 3.55 x 3.3" slab of rock.
Comes with an acrylic display stand.
Comes with an acrylic display stand.
Annularia is the form genus of leaf clusters of tree-like sphenophytes (horsetails) known as Calamites.
Leaves on Calamites trees formed in clusters of 8 or more, called whorls, at spaced nodes along stems. Annularia indicate flat, starburst-shaped whorls, but the shapes of the leaves themselves could vary from oval (A. sphenophylloides) to lanceolate or needle-like (A. radiata). They can also be identified by midline veins throughout the leaf from node to leaf tip.
We use these terms to describe the shapes of fossil imprints. Exact species are often difficult to determine, but these form taxa help to distinguish the prolific species of sphenophytes that defined the Carboniferous Period.
Leaves on Calamites trees formed in clusters of 8 or more, called whorls, at spaced nodes along stems. Annularia indicate flat, starburst-shaped whorls, but the shapes of the leaves themselves could vary from oval (A. sphenophylloides) to lanceolate or needle-like (A. radiata). They can also be identified by midline veins throughout the leaf from node to leaf tip.
We use these terms to describe the shapes of fossil imprints. Exact species are often difficult to determine, but these form taxa help to distinguish the prolific species of sphenophytes that defined the Carboniferous Period.
SPECIES
Annularia carinata
LOCATION
France
FORMATION
Montceau-les-Mines Lagerstatte
SIZE
Stalk: 3" long, Rock: 3.55 x 3.3"
CATEGORY
ITEM
#338432
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