繁體中文
土木工程拓展署土力工程處《香港地質導賞書》（2007 年 6 月首版）第 1 章記載：香港最古老嘅出露地層係泥盆紀嘅黃竹角咀組，沿赤門海峽北岸（白沙頭洲至黃竹角咀）出露，海峽南岸嘅馬鞍山一帶亦有；岩層受地殼運動影響傾側至近乎直立，厚逾 800 米，含雙殼類、介形蟲、盾皮魚同蕨類化石，下段指示下泥盆紀至中泥盆紀、上段屬上泥盆紀，馬鞍山亦錄得標準晚泥盆紀植物化石。呢條係官方一手文獻嘅里程碑，唔屬《香港志》志錄抽取層；時間標籤照來源只寫紀名（來源冇寫以百萬年計嘅定年），時間軸位置純為排序，唔代表本站對岩石定年。
English
Chapter 1 of the Hong Kong Geology Guide Book (Geotechnical Engineering Office, CEDD; first published June 2007) records that the oldest strata exposed in Hong Kong are the Devonian Bluff Head Formation, cropping out along the northern shore of Tolo Channel from Pak Sha Tau Chau to Bluff Head and also around Ma On Shan on the southern shore. Earth movements tilted the beds to a sub-vertical attitude; the formation is over 800 m thick and carries bivalve, ostracod, placoderm and fern fossils, its lower unit indicating a Lower to Middle Devonian age and its upper unit an Upper Devonian age, with a standard Late Devonian plant fossil also recorded at Ma On Shan. This is an official primary-source milestone, not part of the extracted Chronicles archive; the time label reproduces the source, which names the period only (it gives no million-year dating), and the timeline position exists purely for ordering and is not a dating claim by this site.
出處：《香港地質導賞書》第 1 章「香港最古老嘅出露岩石——黃竹角咀組」（印刷頁 8–11）；官方出版頁見來源清單。Provenance: Hong Kong Geology Guide Book, chapter 1, “Oldest Rocks Exposed in Hong Kong – The Bluff Head Formation” (printed pp. 8–11); publication page listed under sources.