Fig. 5
From: Halysis Høeg, 1932 — an ancestral tabulate coral from the Ordos Basin, North China
Halysis from the Upper Ordovician Lianglitage Formation of Bachu area in the Tarim Basin, Northwest China. a Cross section of a ‘multiple-tube’ Halysis; b Enlarged view of the red box in Fig. 5a shows an elliptical tube filled with sparite; c Cross section of a ‘multiple-tube’ Halysis composed of tubes with various diameters; d Enlarged view of the red box in Fig. 5c showing inconspicuous laminofibrous microstructure