Table 1 Tube measurement of the Halysis from the Middle Ordovician Zhuozishan and Kelimoli Formations of the Laoshidan section in Northwest Ordos Basin, North China
From: Halysis Høeg, 1932 — an ancestral tabulate coral from the Ordos Basin, North China
Dp (μm) | Wp (μm) | Dn (μm) | Wn (μm) | Dp/Dn | Wp/Wn | |
|---|---|---|---|---|---|---|
‘Multiple-tube’ Halysis | ||||||
Mean | 110.6 | 9.8 | 111.1 | 10.5 | 0.99 | 0.93 |
Maximun | 178 | 19 | 165 | 19.2 | 1.32 | 1.33 |
Minimum | 60 | 5 | 72 | 7 | 0.77 | 0.50 |
‘Single-tube’ Halysis | ||||||
Mean | 155.5 | 12.5 | 157.5 | 12.7 | 0.99 | 0.98 |
Maximun | 220 | 20 | 195 | 20 | 1.14 | 1.29 |
Minimum | 112 | 8 | 120 | 9.7 | 0.87 | 0.77 |