- †Triarthrus
becki †Triarthrus
eatoni †Tricornina †Triendoceras †Triendoceras
orthoseptatum †Trigonodictya †Trigonodictya
acuta †Trigonograptus †Trigrammaria †Triloboxylon...
- †Astartella †Astartella
subquadrata †Asthenophyllum †Asthenophyllum
orthoseptatum –
tentative report †Astreptodictya †Astroproetus †Asymphylotoechia †Asymphylotoechia...
