The uppermost Triassic to Lower Jurassic interval has not been extensively studied across the island of Ireland. This paper seeks to redress that situation and presents a synthesis of records of the uppermost Triassic and Lower Jurassic from both onshore and offshore basins as well as describing the sedimentological characteristics of the main lithostratigraphical units encountered. Existing data have been supplemented with a re-examination and logging of some outcrops and the integration of data from recent hydrocarbon exploration wells and boreholes. The Late Triassic Penarth Group and Early Jurassic Lias Group can be recognised across the Republic of Ireland and Northern Ireland. In some onshore basins, almost 600 m of strata are recorded, however in offshore basins thicknesses in excess of two kilometres for the Lower Jurassic have now been recognised, although little detailed information is currently available. The transition from the Triassic to the Jurassic was a period of marked global sea-level rise and climatic change (warming) and this is reflected in the lithostratigraphical record of these sediments in the basins of Northern Ireland and offshore basins of the Republic of Ireland. In general, the sediments of this interval are thicker than those in Great Britain and have potential for detailed study of climatic and sea-level fluctuation.

整个爱尔兰岛尚未对最上层的三叠纪至下侏罗纪区间进行广泛研究。本文试图纠正这种情况，并综合介绍了陆上和近海盆地三叠纪和下侏罗统上层的记录，并描述了所遇到的主要岩石地层单元的沉积学特征。对一些露头的重新检查和测井，以及对近期油气勘探井和钻孔数据的整合，对现有数据进行了补充。晚三叠世 Penarth 群和早侏罗世 Lias 群可以在整个爱尔兰共和国和北爱尔兰被认可。在一些陆上盆地，记录了近 600 m 的地层，然而，在近海盆地中，下侏罗纪超过 2 公里的厚度现已被确认，尽管目前几乎没有详细信息。从三叠纪到侏罗纪的过渡是全球海平面显着上升和气候变化（变暖）的时期，这反映在北爱尔兰盆地和爱尔兰共和国近海盆地的这些沉积物的岩石地层记录中。总的来说，该区间的沉积物比英国的沉积物厚，具有详细研究气候和海平面波动的潜力。从三叠纪到侏罗纪的过渡是全球海平面显着上升和气候变化（变暖）的时期，这反映在北爱尔兰盆地和爱尔兰共和国近海盆地的这些沉积物的岩石地层记录中。总的来说，该区间的沉积物比英国的沉积物厚，具有详细研究气候和海平面波动的潜力。从三叠纪到侏罗纪的过渡是全球海平面显着上升和气候变化（变暖）的时期，这反映在北爱尔兰盆地和爱尔兰共和国近海盆地的这些沉积物的岩石地层记录中。总的来说，该区间的沉积物比英国的沉积物厚，具有详细研究气候和海平面波动的潜力。