44:
48:
Folded and metamorphosed limestone of the Boyne Bay
Formation of the Tayvallich Subgroup (the upper part of the Argyll Group) in Boyne Bay, Aberdeenshire
236:
which can reach up to 5 km thick but which is more typically between 500 and 1000m thick. Psammites and pelites occur within the sequence in the
346:
Formation. The succession is between 100 and 250m thick but can reach up to 2.5 km in the east where the psammites and semipelites occur. The
491:
220:, a diamictite which displays limestone clasts overlain by quartzite and granite clasts. The tillite is thickest in its type area and on the
553:
524:
470:
441:
412:
383:
208:
and is itself divided into four units; from oldest to youngest these are the Islay, Easdale, Crinan and
Tayvallich subgroups.
217:
597:
43:
216:
The lower boundary of the Islay
Subgroup and hence the Argyll Group as a whole is defined at the base of the
287:
85:
318:
of this subgroup varies across
Scotland but is dominantly limestone though this is replaced in the east by
252:
144:
57:
573:
Strachan, R.A., Harris, A.L., Fettes, D.J. & Smith, M. 2002 The
Highland and Grampian Terranes.
495:
294:
deposit. These rocks which are between 1.5 and 3 km thick, extend the width of
Scotland from
232:
correlates with this tillite. The tillite is overlain by the
Bonahaven Dolomite and then the Jura
229:
197:
159:
193:
140:
334:
in
Knapdale, after which area the subgroup is named, where it consists of the Tayvallich
267:
263:
190:
35:
591:
291:
31:
545:
516:
462:
433:
404:
375:
492:"British Geological Survey (BGS) | large image viewer | IIPMooViewer 2.0"
237:
225:
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17:
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128:
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343:
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67:
204:, as well as appearing in the north of Ireland. It is a subdivision of the
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319:
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259:
118:
295:
303:
249:
174:
132:
335:
306:, otherwise it is formed from pelites, semipelites and psammites.
327:
262:. It also includes pelites, semipelites, psammites and some
302:. Their base is characterised by a coarse quartzite in
170:
165:
155:
150:
124:
114:
109:
101:
91:
81:
73:
63:
53:
25:
77:Islay, Easdale, Crinan and Tayvallich subgroups
278:coast, the unit can reach to 3 km thick.
8:
42:
22:
248:The Easdale Subgroup consists of a basal
581:The Geological Society, London pp 96-99
367:
342:Formation and the overlying Tayvallich
286:The Crinan Subgroup is formed by the
7:
14:
350:Limestone Formation extends from
556:from the original on 2016-12-20
550:BGS Lexicon of Named Rock Units
527:from the original on 2016-12-20
521:BGS Lexicon of Named Rock Units
473:from the original on 2016-12-20
467:BGS Lexicon of Named Rock Units
444:from the original on 2016-12-20
438:BGS Lexicon of Named Rock Units
415:from the original on 2016-12-20
409:BGS Lexicon of Named Rock Units
386:from the original on 2016-12-20
380:BGS Lexicon of Named Rock Units
546:"Loch Tay Limestone Formation"
1:
218:Port Askaig Tillite Formation
198:Central Highlands of Scotland
330:and pelites are seen around
228:Boulder Bed of the eastern
614:
15:
266:rocks. Extending between
41:
30:
579:The Geology of Scotland.
196:that outcrop across the
186:is a thick sequence of
86:Southern Highland Group
517:"Tayvallich Subgroup"
16:For the company, see
206:Dalradian Supergroup
68:Dalradian Supergroup
598:Geology of Scotland
310:Tayvallich Subgroup
290:Grits Formation, a
32:Stratigraphic range
577:Trewin, N.H. (ed)
434:"Easdale Subgroup"
160:Scottish Highlands
463:"Crinan Subgroup"
194:sedimentary rocks
180:
179:
605:
582:
571:
565:
564:
562:
561:
542:
536:
535:
533:
532:
513:
507:
506:
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503:
494:. Archived from
488:
482:
481:
479:
478:
459:
453:
452:
450:
449:
430:
424:
423:
421:
420:
405:"Islay Subgroup"
401:
395:
394:
392:
391:
372:
255:overlain by the
244:Easdale Subgroup
46:
23:
613:
612:
608:
607:
606:
604:
603:
602:
588:
587:
586:
585:
572:
568:
559:
557:
544:
543:
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530:
528:
515:
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510:
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476:
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447:
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432:
431:
427:
418:
416:
403:
402:
398:
389:
387:
374:
373:
369:
364:
312:
284:
282:Crinan Subgroup
246:
214:
49:
21:
12:
11:
5:
611:
609:
601:
600:
590:
589:
584:
583:
566:
537:
508:
483:
454:
425:
396:
376:"Argyll Group"
366:
365:
363:
360:
311:
308:
283:
280:
264:volcaniclastic
245:
242:
213:
212:Islay Subgroup
210:
200:, east of the
191:Neoproterozoic
178:
177:
172:
168:
167:
163:
162:
157:
153:
152:
148:
147:
126:
122:
121:
116:
112:
111:
107:
106:
103:
99:
98:
93:
89:
88:
83:
79:
78:
75:
71:
70:
65:
61:
60:
55:
51:
50:
47:
39:
38:
36:Neoproterozoic
28:
27:
13:
10:
9:
6:
4:
3:
2:
610:
599:
596:
595:
593:
580:
576:
570:
567:
555:
551:
547:
541:
538:
526:
522:
518:
512:
509:
498:on 2020-06-06
497:
493:
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458:
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414:
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385:
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377:
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361:
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353:
349:
345:
341:
337:
333:
329:
325:
321:
317:
309:
307:
305:
301:
297:
293:
292:submarine fan
289:
281:
279:
277:
273:
269:
265:
261:
258:
254:
251:
243:
241:
239:
235:
231:
227:
223:
219:
211:
209:
207:
203:
199:
195:
192:
189:
188:metamorphosed
185:
176:
173:
169:
164:
161:
158:
154:
149:
146:
142:
138:
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127:
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90:
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84:
80:
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72:
69:
66:
62:
59:
56:
52:
45:
40:
37:
33:
29:
24:
19:
578:
574:
569:
558:. Retrieved
549:
540:
529:. Retrieved
520:
511:
500:. Retrieved
496:the original
486:
475:. Retrieved
466:
457:
446:. Retrieved
437:
428:
417:. Retrieved
408:
399:
388:. Retrieved
379:
370:
313:
285:
253:Conglomerate
247:
238:Ladder Hills
226:Schiehallion
215:
184:Argyll Group
183:
181:
166:Type section
145:conglomerate
26:Argyll Group
18:Argyll Foods
352:Campbeltown
300:Fraserburgh
276:Moray Firth
222:Garvellachs
96:Appin Group
560:2016-12-12
531:2016-12-12
502:2019-09-04
477:2016-12-12
448:2016-12-12
419:2016-12-12
390:2016-12-11
362:References
332:Tayvallich
202:Great Glen
129:semipelite
356:Glen Isla
340:Limestone
324:quartzite
316:lithology
257:Craignish
234:Quartzite
230:Grampians
171:Named for
137:quartzite
110:Lithology
105:up to 9km
102:Thickness
82:Underlies
74:Sub-units
592:Category
554:Archived
525:Archived
471:Archived
442:Archived
413:Archived
384:Archived
348:Loch Tay
344:Volcanic
320:psammite
274:and the
272:Knapdale
260:Phyllite
151:Location
141:dolomite
119:psammite
92:Overlies
296:Kintyre
224:. The
115:Primary
64:Unit of
304:Argyll
288:Crinan
250:Scarba
240:area.
175:Argyll
156:Region
133:pelite
336:Slate
328:Lavas
125:Other
58:Group
338:and
322:and
314:The
268:Jura
182:The
54:Type
575:In:
354:to
298:to
594::
552:.
548:.
523:.
519:.
469:.
465:.
440:.
436:.
411:.
407:.
382:.
378:.
358:.
326:.
270:,
143:,
139:,
135:,
131:,
34::
563:.
534:.
505:.
480:.
451:.
422:.
393:.
20:.
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