![Thumbnail: [Volume 79, 1951 page 528]](/journals/rsnz/images/rsnz_79/thumbnails/rsnz_79_03_0745_0528_ac_02.gif)
This was no easy matter to decide, but with increasing material as collecting proceeded, a more definite idea was obtained. All along, it
![Thumbnail: [Volume 79, 1951 page 529]](/journals/rsnz/images/rsnz_79/thumbnails/rsnz_79_03_0746_0529_ac_02.gif)
was patent that while septa are in an advanced stage of the ceratitic type, ornamentation lags, and a more or less completely involute type prevails.
Tixt-figure 1
Ussuria cultrata is an important find, and it is not the only species of this genus represented, for fragments of a form with a wider venter were early found. Ussuria cultrata is limited to one particular horizon, that is, the cliff quarry at the bridge and ford, loc. 1, at about one third the height of the cliff face.
![Thumbnail: [Volume 79, 1951 page 530]](/journals/rsnz/images/rsnz_79/thumbnails/rsnz_79_03_0747_0530_ac_02.gif)
However, it must be pointed out that until the latest visit Beaumontites tepungai was restricted to the same locality. It was then found in the tuff beds two miles further north.
Fragments of Leiophyllites marshalli were found at all outcrops, often as external casts or moulds, until at last identifiable specimens were secured in the tuff beds.
Summing up impressions to date, the Beaumont beds are regarded as near the top of the Lower Triassic and older than the main Ceratite development of the Middle Trias.
List of Beaumont Ammonoid Faunule
-
Beaumontites fraseri Browne n.gen., n.sp.
-
Beaumontites bartrumi Browne n.sp.
-
Beaumontites routi Browne n.sp.
-
Beaumontites tepungai Browne n.sp.
-
Leiophyllites marshalli Browne n.sp.
-
Ussuria cultrata Browne n.sp.
-
Ussuria sp.