Sanfordiacaulis densifolia is an extinct tree species that existed between 359 and 347 million years ago (Carboniferous period) in what is now New Brunswick, Canada. Its architecture consisted of an unbranched, 16-cm-diameter trunk with compound leaves arranged in spirals of 13 cm and compressed into 14 cm of vertical trunk length. Compound leaves in the upper 0.75 m of the trunk measured over 1.75 m in length and preserved alternately arranged secondary...
