Calamites is a genus of extinct arborescent (tree-like) horsetails to which the modern horsetails (genus Equisetum) are closely related. [1] Unlike their herbaceous modern cousins, these plants were medium-sized trees, growing to heights of 30–50 meters (98–164 ft). [ 2 ]

Calamites, genus of tree-sized, spore-bearing plants that lived during the Carboniferous and Permian periods (about 360 to 250 million years ago). Calamites had a well-defined node-internode architecture similar to modern horsetails, and its branches and leaves emerged in whorls from these nodes.

Jan 5, 2023 · Fossil of the month: Calamites. This month’s fossil is one of the most common fossils in the Eastern Kentucky Coal Field. It is the fossil horsetail rush, Calamites. Description. Calamites is a fossil “horsetail” or “scouring” rush. Rushes are reed-like plants with jointed stems.

The stem anatomy of Calamites shows an epidermis, cortex and an endarch siphonostele (Fig. 7.76A). The young stem shows differentia­tion of cortical tissue: an outer sclerotic zone and an inner thin-walled parenchymatous zone.

horsetails called Calamites which were tree-sized plants reaching a height of approximately 20 m. In Arkansas the best preserved of these fossils are found in Pennsylvanian age rocks from the Arkansas River Valley.

Calamites is the most common of the three found in Kentucky. Calamites ribs abut against each other at the joint or node with a subtle sawtooth-like pattern. Ribs in successive intervals between joints are nodes are slightly offset.

In this article we will discuss about the external features and internal structure of calamites. External Features of Calamites: The calamitean fossils range from pith casts, stems, twigs and leaves to strobili. The stem is known as Calamities, leafy twigs are called An nularia, and fructification is known as Calamostachys.

Calamites. Calamites is a name (= form-genus) for compression/impression and pith casts of arborescent sphenophytes related to modern horsetails.

Calamites extends from the Late Mississippian into the Permian and is reconstructed as an upright, arborescent plant that grew to a height of ∼20 m; stems could reach a diameter of >60 cm, for example, Arthropitys ezonata (FIG. 10.32) (Rössler and Noll, 2006).

Calamitaceae is an extinct family of equisetalean plants related to the modern horsetails, known from the Carboniferous and Permian periods. [1] Some members of this family like Arthropitys attained tree-like stature, with heights over 15 metres (49 ft), with extensive underground rhizomes.They were largely found in wetland environments. [2]