{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,11]],"date-time":"2026-03-11T12:12:10Z","timestamp":1773231130040,"version":"3.50.1"},"reference-count":30,"publisher":"Geological Society of London","issue":"3","license":[{"start":{"date-parts":[[1972,11,1]],"date-time":"1972-11-01T00:00:00Z","timestamp":89424000000},"content-version":"stm-asf","delay-in-days":0,"URL":"https:\/\/doi.org\/10.15223\/policy-002"}],"content-domain":{"domain":["www.lyellcollection.org"],"crossmark-restriction":true},"short-container-title":["SJG"],"published-print":{"date-parts":[[1972,11]]},"abstract":"<jats:title>Synopsis<\/jats:title>\n          <jats:p>The Bonahaven Dolomite (?295 m thick) lies in the Dalradian sequence between the Port Askaig Tillite (beneath) and the Jura Quartzite (above) and is best developed on Islay (Inner Hebrides). The sequence in the formation at five coastal outcrops is figured and four members erected. Member 3 (?150 m thick) contains stromatolite structures at ten horizons. These are described in terms of their bed geometry (laterally continuous, discontinuous), lamination (0.5\u20132 mm thick) and growth structures (stratiform, laterally linked hemispheroids, columnar, irregular). Ptygmatic sandstone crack\u2013structures are ubiquitous in thinly interbedded sandstone\/siltstone beds; they are thought to be subaqueous contraction cracks. The apparent palaeoclimatological contradiction posed by a dolomite overlying a tillite is discussed, and it is suggested that late Precambrian dolomites may not have needed a warm climate to form.<\/jats:p>","DOI":"10.1144\/sjg08030269","type":"journal-article","created":{"date-parts":[[2010,1,15]],"date-time":"2010-01-15T00:29:39Z","timestamp":1263515379000},"page":"269-282","update-policy":"https:\/\/doi.org\/10.1144\/crossmark-policy","source":"Crossref","is-referenced-by-count":45,"title":["The Late Precambrian\/Lower Cambrian Bonahaven Dolomite of Islay and its stromatolites"],"prefix":"10.1144","volume":"8","author":[{"given":"Anthony M.","family":"Spencer","sequence":"first","affiliation":[{"name":"BP Exploration Company Ltd., Casilla, 985, Lima, Peru"}]},{"given":"Margaret O.","family":"Spencer","sequence":"additional","affiliation":[{"name":"Department of Geology, City of London Polytechnic, Jewry Street, London."}]}],"member":"1881","published-online":{"date-parts":[[2022,6,7]]},"reference":[{"key":"e_1_2_1_2_1","doi-asserted-by":"publisher","DOI":"10.1144\/GSL.JGS.1933.089.01-04.06"},{"key":"e_1_2_1_3_1","doi-asserted-by":"publisher","DOI":"10.1144\/pygs.28.1.5"},{"key":"e_1_2_1_4_1","doi-asserted-by":"publisher","DOI":"10.1144\/sjg07020175"},{"key":"e_1_2_1_5_1","doi-asserted-by":"publisher","DOI":"10.1144\/GSL.JGS.1916.072.01-04.10"},{"key":"e_1_2_1_6_1","doi-asserted-by":"publisher","DOI":"10.1038\/189633a0"},{"key":"e_1_2_1_7_1","doi-asserted-by":"publisher","DOI":"10.2475\/ajs.267.9.1017"},{"key":"e_1_2_1_8_1","article-title":"A palynological investigation of the Dalradian rocks of Scotland","author":"DOWNIE C.","year":"1971","unstructured":"DOWNIE C., LISTER T. R., HARRIS A. L., FETTES D. J. 1971. A palynological investigation of the Dalradian rocks of Scotland. Rep. No 71\/9, Inst. geol. Sci.","journal-title":"Inst. geol. Sci."},{"key":"e_1_2_1_9_1","first-page":"268","article-title":"Calcareous algae from the Dalradian of Islay","volume":"5","author":"HACKMAN B. D.","year":"1962","unstructured":"HACKMAN B. D., KNILL J. L. 1962. Calcareous algae from the Dalradian of Islay. Palaeontology 5, 268\u2013271.","journal-title":"Palaeontology"},{"key":"e_1_2_1_10_1","doi-asserted-by":"publisher","DOI":"10.1038\/1841860b0"},{"key":"e_1_2_1_11_1","first-page":"1","article-title":"The Port Askaig Tillite succession (Dalradian) of Co. Donegal","volume":"71","author":"HOWARTH R. J.","year":"1971","unstructured":"HOWARTH R. J. 1971. The Port Askaig Tillite succession (Dalradian) of Co. Donegal. Proc. R. Ir. Acad. 71B, 1\u201335.","journal-title":"Proc. R. Ir. 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Edinburgh, 99\u2013121."},{"key":"e_1_2_1_15_1","first-page":"1","article-title":"[Upper Precambrian stromatolites in the north of Siberian Platform and their stratigraphic significance.]","volume":"154","author":"KOMAR V. A.","year":"1966","unstructured":"KOMAR V. A. 1966. [Upper Precambrian stromatolites in the north of Siberian Platform and their stratigraphic significance.] Trudy Akad. Nauk. SSSR 154, 1\u2013120 [in Russian].","journal-title":"Trudy Akad. Nauk. SSSR"},{"key":"e_1_2_1_16_1","first-page":"207","article-title":"Geochronological investigations of Caledonian history in western Ireland","volume":"63","author":"LEGGO P. J.","year":"1970","unstructured":"LEGGO P. J., PIDGEON R. T. 1970. Geochronological investigations of Caledonian history in western Ireland. Eclog. geol. Helv. 63, 207\u2013212.","journal-title":"Eclog. geol. Helv"},{"key":"e_1_2_1_17_1","doi-asserted-by":"publisher","DOI":"10.1086\/626965"},{"key":"e_1_2_1_18_1","author":"PEACH B. 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(eds), The British Caledonides. 123\u2013142 Edinburgh."},{"key":"e_1_2_1_23_1","first-page":"133","article-title":"In discussion of Brown, P. E., Miller, J. A., Soper, N. J. and York, D. Potassium-argon age pattern of the British Caledonides","volume":"35","author":"RAYNER D. H.","year":"1965","unstructured":"RAYNER D. H. 1965. In discussion of Brown, P. E., Miller, J. A., Soper, N. J. and York, D. Potassium-argon age pattern of the British Caledonides. Proc. Yorks. geol. Soc. 35, 133.","journal-title":"Proc. Yorks. geol. Soc"},{"key":"e_1_2_1_24_1","doi-asserted-by":"publisher","DOI":"10.1038\/234216a0"},{"key":"e_1_2_1_25_1","first-page":"177","article-title":"Discussion of\u2014Late Pre-Cambrian glaciation in Scotland","volume":"1657","author":"SPENCER A. M.","year":"1969","unstructured":"SPENCER A. M. 1969. Discussion of\u2014Late Pre-Cambrian glaciation in Scotland. Proc. geol. Soc. Lond. 1657, 177\u2013198.","journal-title":"Proc. geol. Soc. 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