For example, the subtidal to supratidal zones of the Persian Gulf and Shark Bay in Australia are divided into zones by stromatolites of characteristic shapes, and the upper intertidal zone, where algal mats are particularly well developed, is subdivided into three or four zones. The sediments of the supratidal zone of the Persian Gulf are called sabkha in Arabic, which means salt flat (flat land formed after salt water temporarily evaporates and dries up), and the algal mats from the time when they were intertidal zones can be traced continuously several tens of centimeters below the surface. On the other hand, there is also an opinion that the diversity of forms is due to differences in the types of algae, and based on this idea, there have been attempts to use them as index fossils of Precambrian strata to compare continents. *Some of the terminology explanations that mention "sabkha" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…例えばペルシア湾やオーストラリアのシャーク湾の亜潮間帯から潮上帯にかけては,特徴的な形のストロマトライトで分帯され,ことにアルガルマットのよく発達する潮間帯上部は3~4帯に細分されている。ペルシア湾の潮上帯の堆積物はアラビア語でソールトフラット(塩水が一時的に蒸発乾固したあとにできる平地)を意味するサブハsabkhaとよばれるが,表面から数十cm下には,かつて潮間帯であったころのアルガルマットが連続して追跡できる。一方,形態の多様性を藻類の種類の差とする意見もあり,この考えにたって,先カンブリア時代の地層の示準化石として大陸間の対比につかう試みもなされている。… ※「sabkha」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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