恆春西臺地內出現的脊椎動物化石之意義

Significance of Vertebrate FossiI Occurrence in Hengehung Western Hill

鍾廣吉(Chung, Kuang-Jyi)

《臺灣省立博物館年刊》 38卷 (1995/12) Pp. 79-92

https://doi.org/10.6548/ATMB.199512_38.0004

摘要

將出現在恆春西方臺地四溝層和恆春石灰岩內的脊椎動物化石與新化丘陵及中部頭嵙山地區所出現的脊椎動物化石作更大分佈範圍的分析討論，可以指示這些原有的陸生脊椎動物可構成一生物群落，經同一搬運作用而分散在這些地區者；臺灣本島或恆春半島非這些脊椎動物的生活區，而令陸生脊椎動物遺骸可搬運來臺灣地區的必備條件為臺灣海峽地區的陸化，本文也推測海峽當時的陸化與地殼均衡現象有關，頭嵙山期的巨厚碟石層可能為引起地殼均衡作用的因素之一。至於恆春西方臺地也出現海生鯊魚牙齒化石應指示為古潟湖區的恆春西方臺地堆積有時也呈開闊海域的狀態，為一非均勻條件的堆積區。

關鍵字

恆春石臺地 ； 脊椎動物化石 ； 脊椎動物生活區

並列摘要

The vertebrate fossils occurred from the Su-Kou Formation and Hengchung Limestone in Hengchung Western Hill are studied and compared with those occurred from HsinHua-Hill and Toukoushan area. Accorrding to analysis and discussion about the larger area distribution of these fossils, they show that these original terrestrial vertebrates can compose a life assemblage and then their remains underwent the same trasportation to distribute in these areas. Taiwan Island or Hengchung Penisula area was not the original habitates of these vertebrates. The conditions that can transport these vertebrate remains to Taiwan area were the terrestrialization of Taiwan Strait. This work also infers that the terrestrialization of Taiwan Strait would have related to the isostasy. The very thick conglomerate formation in Toukoushan age would be the one of those causes of isostasy. According to the occurrences of the marine shark tooth fossils, it shows that the paleo-lagoon of Hengchung Western Hill may be open-sea sometimes and it can be said that the area was not a homogenous condition of sedimentary area.

並列關鍵字

Hengchung Western Hill ； Vertebrate Fossils ； The Habitates of Vertebrates