The Lewisian complex of South Harris With some observations on the metamorphosed basic intrusions of the Outer Hebrides, Scotland

RAYMOND DEARNLEY

doi:10.1144/gsjgs.119.1.0243

Abstract

The metamorphic petrology and history of the Lewisian rocks of South Harris are described.

The paragneisses in each of the two main belts are divided into three lithological and possibly stratigraphical units, the disposition of which indicates folding in tight plunging isoclines along Nw–Se (Early Laxfordian) axes. Relic textures indicating an early (pre-Lax-fordian) metamorphism and folding are recognizable in the paragneisses and also in the pyroxene-granulites which appear to intrude the paragneisses. This early metamorphism is probably Scourian in age. The pyroxene-granulites are earlier than and are not comagmatic with the igneous complex.

The igneous complex, which is a metamorphosed differentiated (and possibly originally layered) anorthosite–gabbro–tonalite mass, together with the metamorphosed basic intrusions in its immediate vicinity and the widespread metamorphosed basic dykes and sills in the Outer Hebrides, constitute an essentially non-orogenic suite of post-Scourian pre-Early Laxfordian age. The geochemistry of this suite shows it to be tholeiitic in character and probably closely related to the Scourie dykes of the Scottish mainland.

Early Laxfordian granulite-facies metamorphism associated with the main Nw–Se folding of the area followed the emplacement of the non-orogenic igneous suite. A south-easterly plunge and north-easterly overturning characterize the folds to the north-east of the igneous complex; to the south-west the plunge is north-west, and the overturning is to the south-west.

A Late Laxfordian injection-complex situated to the north-east comprises extensive areas of migmatization and granitic intrusion and is associated with a front of hydrous retrograde metamorphism which strongly affects the Langavat paragneisses and parts of the igneouscomplex. The sinuous trend of the Langavat paragneisses is attributed to cross-folding of thisdate.

All the earlier rock-types are cut by a suite of Late Laxfordian granite pegmatites containing uranium, thorium, and rare-earth minerals.

References

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(1932) The Adirondack anorthosite and its problems. J Geol 40:193–237.
OpenUrl Web of Science
Bailey, E. B. & others. 1924. Tertiary and post-Tertiary Geology of Mull, Loch Aline, and Oban. Mem. geol. Surv. Scotld.
1. Buddington A. F.
(1952) Chemical petrology of some metamorphosed Adirondack gabbroic, syenitic and quartz syenitic rocks. Amer. J. Sci, 37–84, (Bowen Volume).
1. Davidson C. F.
(1943) The Archaean rocks of the Rodil district, South Harris, Outer Hebrides. Trans, roy Soc Edinb 61:71–112.
OpenUrl
1. Dearnley R.
(1961) Humite and chondrodite in a Lewisian crystalline limestone from South Harris, Outer Hebrides. Miner Mag 32:910–11.
OpenUrl
1. Dearnley R.
(1962a) An outline of the Lewisian complex of the Outer Hebrides in relation to that of the Scottish mainland. Quart J geol Soc Lond 118:143–66.
OpenUrl CrossRef
1. Dearnley R.
(1962b) Diopside–orthoclase–hornblende rocks from the Lewisian paragneisses of South Harris, Outer Hebrides. Geol Mag 99:27–9.
OpenUrl Abstract
1. Dougal J. W.
(1928) Observations on the geology of Lewis. Trans Edinb geol Soc 12:12–18.
OpenUrl
1. Eskola P.
(1952) On the granulites of Lapland. Amer. J. Sci, 133–71, (Bowen Volume).
1. Fyfe W. S.,
2. Turner F. J.,
3. Verhoogen J.
(1958) Metamorphic reactions and metamorphic facies. Mem. geol. Soc. Amer 73.
1. Giletti B. J.,
2. Moorbath S.,
3. Lambert R. St. J
(1961) A geochronological study of the metamorphic complexes of the Scottish Highlands. Quart J geol Soc Lond 117:233–64.
OpenUrl CrossRef
1. Goldschmidt V. M.
(1934) Drei Vorträge über Geochemie. Geol Fören Stockh Förh 56:385–427.
OpenUrl
1. Goldschmidt V. M.
(1937) The principles of distribution of chemical elements in minerals and rocks. J. chem. Soc, 655–73, [for 1937].
1. Goldschmidt V. M.
(1938) Geochemische Verteilungsgesetze der Elemente, IX. Die Mengenverhältnisse der Elemente und der Atom-Arten. Skr. norske VidenskAkad 4.
1. Goldschmidt V. M.,
2. Peters Cl
(1931) Zur Geochemie des Galliums. Nachr Ges Wiss, Göttingen, fachgruppe IV 11:165–83.
OpenUrl
1. Groves A. W.
(1935) The charnockite series of Uganda, British East Africa. Quart J geol Soc Lond 91:150–207.
OpenUrl
Guppy, E. M. & Sabine, P. A. 1956. Chemical analyses of igneous rocks, metamorphic rocks and minerals 1931–1954. Mem. geol. Surv. G.B.
Harvie-Brown, J. A. & Buckley, T. E. 1888. A vertebrate fauna of the Outer Hebrides.
1. Heddle M. F.
(1878) Chapters on the mineralogy of Scotland Chapter fourth—augite, hornblende, and serpentinous change Trans, roy Soc Edinb 28:453–555.
OpenUrl
1. Heddle M. F.
(1901) The mineralogy of Scotland (Edinburgh) [2 vols.].
1. Howie R. A.,
2. Subramaniam A. P.
(1957) The paragenesis of garnet in charnockite, enderbite and related granulites. Miner Mag 31:565–86.
OpenUrl
1. Jehu T. J.,
2. Craig R. M.
(1923) Geology of the Outer Hebrides Part I The Barra Isles Trans roy Soc Edinb 53:419–41.
OpenUrl
1. Jehu T. J.,
2. Craig R. M.
(1925) Geology of the Outer Hebrides Part II South Uist and Eriskay Trans, roy Soc Edinb 53:615–41.
OpenUrl
1. Jehu T. J.,
2. Craig R. M.
(1926) Geology of the Outer Hebrides Part III North Uist and Benbecula Trans roy Soc Edinb 54:467–89.
OpenUrl
1. Jehu T. J.,
2. Craig R. M.
(1927) Geology of the Outer Hebrides Part IV South Harris Trans, roy Soc Edinb 55:457–88.
OpenUrl
1. Jehu T. J.,
2. Craig R. M.
(1934) Geology of the Outer Hebrides Part V North Harris and Lewis Trans, roy Soc Edinb 57:839–74.
OpenUrl
1. Kennedy W. Q.
(1933) Trends of differentiation in basaltic magmas. Amer J Sci 25(5):239–56.
OpenUrl
1. Kennedy W. Q.,
2. Anderson E. M.
(1938) Crustal layers and the origin of magmas. Bull, volcan 3(2):24–82.
OpenUrl CrossRef
1. Knorring O. von,
2. Dearnley R.
(1960) The Lewisian pegmatities of South Harris, Outer Hebrides. Miner Mag 32:366–78.
OpenUrl CrossRef
1. Kursten M.
(1957) The metamorphic and tectonic history of parts of the Outer Hebrides. Trans Edinb geol Soc 17:1–31.
OpenUrl
1. Lundegårdh P. H.
(1947) Rock composition and development in Central Roslagen, Sweden. Ark Kemi Min Geol 23:1–160.
OpenUrl
1. Lundegårdh P. H.
(1949) Aspects to the geochemistry of chromium, cobalt, nickel and zinc. Sverig geol Unders 43:11, Ser C, Års.
OpenUrl
1. MacCulloch J.
(1819) A description of the Western Isles of Scotland including the Isle of Man (London) [3 vols.].
1. Miyashiro A.
(1953) Calcium-poor garnet in relation to metamorphism. Geochim et cosmoch Acta 4:179.
OpenUrl CrossRef
1. Nockolds S. R.
(1954) Average chemical compositions of some igneous rocks. Bull. geol. Soc. Amer 65.
1. Nockolds S. R.,
2. Allen R.
(1956) The geochemistry of some igneous rock series—III. Geochim et cosmoch Acta 9:34–77.
OpenUrl CrossRef
1. Nockolds S. R.,
2. Mitchell R. L.
(1948) The geochemistry of some Caledonian plutonic rocks; a study in the relationship between the major and trace elements of igneous rocks and their minerals. Trans, roy Soc Edinb 61:533–75.
OpenUrl
1. O’Hara M. J.
(1961) Petrology of the Scourie dyke, Sutherland. Miner Mag 32:848–65.
OpenUrl CrossRef
Peach, B. N. & others. 1907. The geological structure of the North-West Highlands of Scotland. Mem. geol. Surv. G.B.
1. Ramberg H.
(1952) The origin of metamorphic and metasomatic rocks; a treatise on recrystallization and replacement in the earth’s crust (Chicago).
Richey, J. E. & others. 1930. The geology of Ardnamurchan, north-west Mull and Coll. Mem. geol. Surv. Scotld.
1. Robertson T.
(1945) Scottish sources of alkali feldspar. Wartime Pamphl. geol. Surv. Engl 44.
1. Simonen A.
(1948) On the petrochemistry of the infracrustal rocks in the Svecofennidic territory of south-western Finland. Bull. Comm. géol. Finl 141.
1. Sørensen H.
(1953) The ultrabasic rocks at Touqussaq, West Greenland. Grønl. geol. Unders. Bull 4.
1. Sutton J.,
2. Watson J.
(1951) The pre-Torridonian metamorphic history of the Loch Torridon and Scourie areas in the North-West Highlands and its bearing on the chronological classification of the Lewisian. Quart. J. geol. Soc. Lond 106:241–96, [for 1950].
OpenUrl
1. Taubeneck W. H.,
2. Poldervaart A.
(1960) Geology of the Elkham Mountains, Northeastern Oregon: Part 2 Willow Lake intrusion Bull geol Soc Amer 71:1295–321.
OpenUrl Abstract/FREE Full Text
1. Teall J. J. H.
(1885) The metamorphosis of dolerite into hornblende-schist. Quart J geol Soc Lond 41:133–44.
OpenUrl
1. Tilley C. E.
(1951) Some aspects of magmatic evolution. Quart. J. geol. Soc. Lond 106:37–61, [for 1950].
OpenUrl
1. Tröger E.
(1935) Der Gehalt an selteneren Elementen bei Eruptivgesteinen. Chem d Erde 9:286–310.
OpenUrl
1. Tyrrell G. W.,
2. Sandford K. S.
(1933) Geology and petrology of the dolorites of Spits-bergen. Proc roy Soc Edinb 53:284–321.
OpenUrl
1. Wager L. R.
(1956) A chemical definition of fractionation stages as a basis for comparison of Hawaiian, Hebridean, and other basic lavas. Geochim et cosmoch Acta 9:217–48.
OpenUrl CrossRef
1. Wager L. R.
(1960) The major element variation of the layered series of the Skaergaard intrusion and a re-estimation of the average composition of the hidden layered series and of the successive residual magmas. J Petrol, Oxford 1:364–98.
OpenUrl
1. Wager L. R.,
2. Mitchell R. L.
(1943) Preliminary observations on the distribution of trace elements in the rocks of the Skaergaard intrusion, Greenland. Miner Mag 26:283–96.
OpenUrl CrossRef
1. Wager L. R.,
2. Mitchell R. L.
(1945) Distribution of vanadium, chromium, cobalt and nickel in eruptive rocks. Nature, Lond 156:207–8.
OpenUrl
Wager, L. R. & Mitchell, R. L. 1950. The distribution of Cr, V, Ni, Co and Cu during the fractional crystallization of a basic magma. Int. geol. Congr. Eighteenth Session, pt II, 140–50.
1. Wager L. R.,
2. Mitchell R. L.
(1951) The distribution of trace elements during strong fractionation of basic magma–a further study of the Skaergaard intrusion, East Greenland. Geochim et cosmoch Acta 1:129–208.
OpenUrl CrossRef
1. Wager L. R.,
2. Mitchell R. L.
(1953) Trace elements in a suite of Hawaiian Lavas. Geochim et cosmoch Acta 3:217–23.
OpenUrl CrossRef
1. Wagner P. A.
(1924) Magmatic nickel deposits of the Bushveld complex in the Rustenburg District, Transvaal. Mem. geol. Surv. S. Afr 21.

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[1] Alling H. L.
(1932) The Adirondack anorthosite and its problems. J Geol 40:193–237.
OpenUrl Web of Science

[2] Alling H. L.

[3] Bailey, E. B. & others. 1924. Tertiary and post-Tertiary Geology of Mull, Loch Aline, and Oban. Mem. geol. Surv. Scotld.

[4] Buddington A. F.
(1952) Chemical petrology of some metamorphosed Adirondack gabbroic, syenitic and quartz syenitic rocks. Amer. J. Sci, 37–84, (Bowen Volume).

[5] Buddington A. F.

[6] Davidson C. F.
(1943) The Archaean rocks of the Rodil district, South Harris, Outer Hebrides. Trans, roy Soc Edinb 61:71–112.
OpenUrl

[7] Davidson C. F.

[8] Dearnley R.
(1961) Humite and chondrodite in a Lewisian crystalline limestone from South Harris, Outer Hebrides. Miner Mag 32:910–11.
OpenUrl

[9] Dearnley R.

[10] Dearnley R.
(1962a) An outline of the Lewisian complex of the Outer Hebrides in relation to that of the Scottish mainland. Quart J geol Soc Lond 118:143–66.
OpenUrl CrossRef

[11] Dearnley R.

[12] Dearnley R.
(1962b) Diopside–orthoclase–hornblende rocks from the Lewisian paragneisses of South Harris, Outer Hebrides. Geol Mag 99:27–9.
OpenUrl Abstract

[13] Dearnley R.

[14] Dougal J. W.
(1928) Observations on the geology of Lewis. Trans Edinb geol Soc 12:12–18.
OpenUrl

[15] Dougal J. W.

[16] Eskola P.
(1952) On the granulites of Lapland. Amer. J. Sci, 133–71, (Bowen Volume).

[17] Eskola P.

[18] Fyfe W. S.,
Turner F. J.,
Verhoogen J.
(1958) Metamorphic reactions and metamorphic facies. Mem. geol. Soc. Amer 73.

[19] Fyfe W. S.,

[20] Turner F. J.,

[21] Verhoogen J.

[22] Giletti B. J.,
Moorbath S.,
Lambert R. St. J
(1961) A geochronological study of the metamorphic complexes of the Scottish Highlands. Quart J geol Soc Lond 117:233–64.
OpenUrl CrossRef

[23] Giletti B. J.,

[24] Moorbath S.,

[25] Lambert R. St. J

[26] Goldschmidt V. M.
(1934) Drei Vorträge über Geochemie. Geol Fören Stockh Förh 56:385–427.
OpenUrl

[27] Goldschmidt V. M.

[28] Goldschmidt V. M.
(1937) The principles of distribution of chemical elements in minerals and rocks. J. chem. Soc, 655–73, [for 1937].

[29] Goldschmidt V. M.

[30] Goldschmidt V. M.
(1938) Geochemische Verteilungsgesetze der Elemente, IX. Die Mengenverhältnisse der Elemente und der Atom-Arten. Skr. norske VidenskAkad 4.

[31] Goldschmidt V. M.

[32] Goldschmidt V. M.,
Peters Cl
(1931) Zur Geochemie des Galliums. Nachr Ges Wiss, Göttingen, fachgruppe IV 11:165–83.
OpenUrl

[33] Goldschmidt V. M.,

[34] Peters Cl

[35] Groves A. W.
(1935) The charnockite series of Uganda, British East Africa. Quart J geol Soc Lond 91:150–207.
OpenUrl

[36] Groves A. W.

[37] Guppy, E. M. & Sabine, P. A. 1956. Chemical analyses of igneous rocks, metamorphic rocks and minerals 1931–1954. Mem. geol. Surv. G.B.

[38] Harvie-Brown, J. A. & Buckley, T. E. 1888. A vertebrate fauna of the Outer Hebrides.

[39] Heddle M. F.
(1878) Chapters on the mineralogy of Scotland Chapter fourth—augite, hornblende, and serpentinous change Trans, roy Soc Edinb 28:453–555.
OpenUrl

[40] Heddle M. F.

[41] Heddle M. F.
(1901) The mineralogy of Scotland (Edinburgh) [2 vols.].

[42] Heddle M. F.

[43] Howie R. A.,
Subramaniam A. P.
(1957) The paragenesis of garnet in charnockite, enderbite and related granulites. Miner Mag 31:565–86.
OpenUrl

[44] Howie R. A.,

[45] Subramaniam A. P.

[46] Jehu T. J.,
Craig R. M.
(1923) Geology of the Outer Hebrides Part I The Barra Isles Trans roy Soc Edinb 53:419–41.
OpenUrl

[47] Jehu T. J.,

[48] Craig R. M.

[49] Jehu T. J.,
Craig R. M.
(1925) Geology of the Outer Hebrides Part II South Uist and Eriskay Trans, roy Soc Edinb 53:615–41.
OpenUrl

[50] Jehu T. J.,

[51] Craig R. M.

[52] Jehu T. J.,
Craig R. M.
(1926) Geology of the Outer Hebrides Part III North Uist and Benbecula Trans roy Soc Edinb 54:467–89.
OpenUrl

[53] Jehu T. J.,

[54] Craig R. M.

[55] Jehu T. J.,
Craig R. M.
(1927) Geology of the Outer Hebrides Part IV South Harris Trans, roy Soc Edinb 55:457–88.
OpenUrl

[56] Jehu T. J.,

[57] Craig R. M.

[58] Jehu T. J.,
Craig R. M.
(1934) Geology of the Outer Hebrides Part V North Harris and Lewis Trans, roy Soc Edinb 57:839–74.
OpenUrl

[59] Jehu T. J.,

[60] Craig R. M.

[61] Kennedy W. Q.
(1933) Trends of differentiation in basaltic magmas. Amer J Sci 25(5):239–56.
OpenUrl

[62] Kennedy W. Q.

[63] Kennedy W. Q.,
Anderson E. M.
(1938) Crustal layers and the origin of magmas. Bull, volcan 3(2):24–82.
OpenUrl CrossRef

[64] Kennedy W. Q.,

[65] Anderson E. M.

[66] Knorring O. von,
Dearnley R.
(1960) The Lewisian pegmatities of South Harris, Outer Hebrides. Miner Mag 32:366–78.
OpenUrl CrossRef

[67] Knorring O. von,

[68] Dearnley R.

[69] Kursten M.
(1957) The metamorphic and tectonic history of parts of the Outer Hebrides. Trans Edinb geol Soc 17:1–31.
OpenUrl

[70] Kursten M.

[71] Lundegårdh P. H.
(1947) Rock composition and development in Central Roslagen, Sweden. Ark Kemi Min Geol 23:1–160.
OpenUrl

[72] Lundegårdh P. H.

[73] Lundegårdh P. H.
(1949) Aspects to the geochemistry of chromium, cobalt, nickel and zinc. Sverig geol Unders 43:11, Ser C, Års.
OpenUrl

[74] Lundegårdh P. H.

[75] MacCulloch J.
(1819) A description of the Western Isles of Scotland including the Isle of Man (London) [3 vols.].

[76] MacCulloch J.

[77] Miyashiro A.
(1953) Calcium-poor garnet in relation to metamorphism. Geochim et cosmoch Acta 4:179.
OpenUrl CrossRef

[78] Miyashiro A.

[79] Nockolds S. R.
(1954) Average chemical compositions of some igneous rocks. Bull. geol. Soc. Amer 65.

[80] Nockolds S. R.

[81] Nockolds S. R.,
Allen R.
(1956) The geochemistry of some igneous rock series—III. Geochim et cosmoch Acta 9:34–77.
OpenUrl CrossRef

[82] Nockolds S. R.,

[83] Allen R.

[84] Nockolds S. R.,
Mitchell R. L.
(1948) The geochemistry of some Caledonian plutonic rocks; a study in the relationship between the major and trace elements of igneous rocks and their minerals. Trans, roy Soc Edinb 61:533–75.
OpenUrl

[85] Nockolds S. R.,

[86] Mitchell R. L.

[87] O’Hara M. J.
(1961) Petrology of the Scourie dyke, Sutherland. Miner Mag 32:848–65.
OpenUrl CrossRef

[88] O’Hara M. J.

[89] Peach, B. N. & others. 1907. The geological structure of the North-West Highlands of Scotland. Mem. geol. Surv. G.B.

[90] Ramberg H.
(1952) The origin of metamorphic and metasomatic rocks; a treatise on recrystallization and replacement in the earth’s crust (Chicago).

[91] Ramberg H.

[92] Richey, J. E. & others. 1930. The geology of Ardnamurchan, north-west Mull and Coll. Mem. geol. Surv. Scotld.

[93] Robertson T.
(1945) Scottish sources of alkali feldspar. Wartime Pamphl. geol. Surv. Engl 44.

[94] Robertson T.

[95] Simonen A.
(1948) On the petrochemistry of the infracrustal rocks in the Svecofennidic territory of south-western Finland. Bull. Comm. géol. Finl 141.

[96] Simonen A.

[97] Sørensen H.
(1953) The ultrabasic rocks at Touqussaq, West Greenland. Grønl. geol. Unders. Bull 4.

[98] Sørensen H.

[99] Sutton J.,
Watson J.
(1951) The pre-Torridonian metamorphic history of the Loch Torridon and Scourie areas in the North-West Highlands and its bearing on the chronological classification of the Lewisian. Quart. J. geol. Soc. Lond 106:241–96, [for 1950].
OpenUrl

[100] Sutton J.,

[101] Watson J.

[102] Taubeneck W. H.,
Poldervaart A.
(1960) Geology of the Elkham Mountains, Northeastern Oregon: Part 2 Willow Lake intrusion Bull geol Soc Amer 71:1295–321.
OpenUrl Abstract/FREE Full Text

[103] Taubeneck W. H.,

[104] Poldervaart A.

[105] Teall J. J. H.
(1885) The metamorphosis of dolerite into hornblende-schist. Quart J geol Soc Lond 41:133–44.
OpenUrl

[106] Teall J. J. H.

[107] Tilley C. E.
(1951) Some aspects of magmatic evolution. Quart. J. geol. Soc. Lond 106:37–61, [for 1950].
OpenUrl

[108] Tilley C. E.

[109] Tröger E.
(1935) Der Gehalt an selteneren Elementen bei Eruptivgesteinen. Chem d Erde 9:286–310.
OpenUrl

[110] Tröger E.

[111] Tyrrell G. W.,
Sandford K. S.
(1933) Geology and petrology of the dolorites of Spits-bergen. Proc roy Soc Edinb 53:284–321.
OpenUrl

[112] Tyrrell G. W.,

[113] Sandford K. S.

[114] Wager L. R.
(1956) A chemical definition of fractionation stages as a basis for comparison of Hawaiian, Hebridean, and other basic lavas. Geochim et cosmoch Acta 9:217–48.
OpenUrl CrossRef

[115] Wager L. R.

[116] Wager L. R.
(1960) The major element variation of the layered series of the Skaergaard intrusion and a re-estimation of the average composition of the hidden layered series and of the successive residual magmas. J Petrol, Oxford 1:364–98.
OpenUrl

[117] Wager L. R.

[118] Wager L. R.,
Mitchell R. L.
(1943) Preliminary observations on the distribution of trace elements in the rocks of the Skaergaard intrusion, Greenland. Miner Mag 26:283–96.
OpenUrl CrossRef

[119] Wager L. R.,

[120] Mitchell R. L.

[121] Wager L. R.,
Mitchell R. L.
(1945) Distribution of vanadium, chromium, cobalt and nickel in eruptive rocks. Nature, Lond 156:207–8.
OpenUrl

[122] Wager L. R.,

[123] Mitchell R. L.

[124] Wager, L. R. & Mitchell, R. L. 1950. The distribution of Cr, V, Ni, Co and Cu during the fractional crystallization of a basic magma. Int. geol. Congr. Eighteenth Session, pt II, 140–50.

[125] Wager L. R.,
Mitchell R. L.
(1951) The distribution of trace elements during strong fractionation of basic magma–a further study of the Skaergaard intrusion, East Greenland. Geochim et cosmoch Acta 1:129–208.
OpenUrl CrossRef

[126] Wager L. R.,

[127] Mitchell R. L.

[128] Wager L. R.,
Mitchell R. L.
(1953) Trace elements in a suite of Hawaiian Lavas. Geochim et cosmoch Acta 3:217–23.
OpenUrl CrossRef

[129] Wager L. R.,

[130] Mitchell R. L.

[131] Wagner P. A.
(1924) Magmatic nickel deposits of the Bushveld complex in the Rustenburg District, Transvaal. Mem. geol. Surv. S. Afr 21.

[132] Wagner P. A.

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The Lewisian complex of South Harris With some observations on the metamorphosed basic intrusions of the Outer Hebrides, Scotland

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The Lewisian complex of South Harris With some observations on the metamorphosed basic intrusions of the Outer Hebrides, Scotland

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The Lewisian complex of South Harris With some observations on the metamorphosed basic intrusions of the Outer Hebrides, Scotland

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