23/07/26 00:58:49.17 g6udAtts0FOX.net
Viewed as a whole the Breccia Cave has the appearance of
being an irregular chasm extending downwards into the earth
and filled up for the most part with loose red earth or solid
brecia. Near the surface we find hard red breccia, in which
bones are exceedingly abundant, but perfect specimens cannot
be detached owing to their brittle state and the toughness of
the matrix. But underground the deposit is loose and forms
either a dry red powder from which the bones can be a sifted
clean, or else a slightly tenacious clay in which the bones are
covered with a hard reddish calcareous crust. On the whole,
the bones are more plentiful in the upper portions, and become
scarcer as the depth increases, which would lead to the suppo-
sition that they were originally deposited near the surface, and
there are other appearances which favour this view.
URLﾘﾝｸ(trove.nla.gov.au)
↑the Breccia Caveという洞窟を調査する話
the Breccia Cave has the appearance of ...
「その角礫岩洞穴は～という見た目をしている」
On the whole, the bones are more plentiful in the upper portions, and become scarcer as the depth increases, which would lead to the supposition that they were originally deposited near the surface, and there are other appearances which favour this view. .
「全体として、骨は洞窟の上部のほうが豊富であり、深くなるほど少なくなるため、骨はもともと表層近くに堆積していたと推察される。この見方を支持するappearancesはほかにもある」
この後に、なぜ上部に骨が集まっていて深くなるほど少なくなるのかということを観察・分析していることから appearances = observations, evidence だと思われる
「上辺だけの」というニュアンスは感じられない