22:
339:
123:
408:. Their age of formation is thought to be end-Campanian/Maastrichtian. Possibly they have a transpressive component and share with the South Armorican Shear Zone (SASZ) the same dextral sense of movement. Importantly they have a parallel alignment and a rather uniform spacing of 15–20 km. A local exception in this scheme is the
351:
in the
Turonian strata near the anticline are a good indicator that the first tectonic stirrings had happened in the anticline. Yet the major event responsible for the creation of the structure clearly must have taken place after the Santonian, because the entire sedimentary sequence has been
346:
The first movements in the region of the
Mareuil Anticline must have occurred in the Lower Cretaceous because of the transgressive nature of the Cenomanian. But these movements were not specific to the anticline; they affected the entire northeastern Aquitaine Basin. Synsedimentary
154:
boundary serving as a reference horizon). The short axis is only 2 km in length. The structure is doubly asymmetric, with steeper dipping northeastern and northwestern limbs. It is accompanied on its northeastern side by the
388:. It is known that compressive forces responsible for the Pyrenean orogeny likewise affected the northeastern edge of the Massif Central (i.e. upthrusts within the Dogger can be seen in the quarry of
190:
Seen from the edge of the northeastern
Aquitaine Basin, the Mareuil Anticline forms the first structural high within the sedimentary cover. It runs more or less parallel with the edge of the
146:, somewhat farther to the northwest. In plan view the anticline has the shape of an elongated pear with its long axis aligned NW-SE and reaching about 5 km in length (the
405:
174:
On the southeastern side of the anticline, there are several smaller cross-cutting faults locally disturbing the angle of dip. These cross faults are all following
194:, at a distance of about 15 km. The sedimentary cover reaches a thickness of altogether 400 m in the anticline. In the syncline on the northeast (the
452:
51:
214:
276:
404:
within the northern
Aquitaine Basin. These ridges follow a more or less northwesterly-southeasterly direction and run parallel to the
202:), the sediments reach 700 m in thickness. This is followed 8 km to the southwest by another anticlinal ridge, the
209:
The
Mareuil Anticline is a large-scale structure. To the northwest it changes into a fault zone that can be traced from
440:
73:
44:
380:
is somehow involved in the formation of the anticline. Like the
Pyrenees, the Mareuil Anticline was created under
310:
The strata below the 120 m thick
Kimmeridgian do not outcrop, but the presence of 210 m of underlying
160:
342:
The northwestern edge of the
Mareuil Anticline. The Turonian (Angoumian) cliff is dipping 35° to the NNE.
496:
409:
203:
34:
389:
191:
38:
30:
377:
250:
143:
198:), the sediments are 500 m thick. In the adjoining syncline on the southwestern side (the
55:
381:
218:
164:
258:
206:. In this second anticlinal ridge, the sediments already show a thickness of 1000 m.
8:
491:
436:
311:
131:
299:— mainly hard, fossiliferous limestones. The sequence finishes with 45–60 m of
348:
327:
168:
99:
279:-bearing limestones. The Cenomanian is concordantly overlain by 55–65 m of
352:
deformed by it. This major event is thought to have occurred at the end of the
485:
467:
454:
385:
357:
246:
210:
171:
the northeastern side of the anticline was pushed up by about 30 m.
284:
126:
A cross-section through the
Mareuil Anticline with vertical exaggeration
412:
narrowing to a spacing of 8 km and following a WNW-ESE direction.
323:
265:
261:
179:
178:
directions, either the R- or the R'-position, hinting at an underlying
147:
111:
373:
353:
319:
304:
296:
292:
103:
322:
strata is known from drilling results in the vicinity. Whether thin
338:
315:
280:
242:
151:
135:
107:
95:
217:. To the southeast it also changes into a fault zone running from
365:
254:
222:
122:
369:
288:
272:
175:
139:
300:
268:
236:
283:
strata divided into the nodular, chalky limestones of the
249:) strata are exposed — thinly bedded, cryptocrystalline,
364:). But there is also a good possibility that the main
241:In the core of the anticline the top 20 m of
483:
43:but its sources remain unclear because it lacks
117:
257:). After a long hiatus follow 8–20 m of
196:Combiers-Saint-Crépin-de-Richemont Syncline
395:
423:Carte GĂ©ologique de la France Ă 1:50 000.
74:Learn how and when to remove this message
400:The Mareuil Anticline forms part of the
337:
237:Stratigraphy of the sedimentary sequence
121:
484:
295:. This is followed by 50–65 m of
142:. The centre of the structure is near
15:
333:
307:, in places rich in oyster debris.
185:
134:, a small town in the northwestern
110:movements probably starting in the
102:. The northwest-southeast trending
13:
94:, is a structural high within the
14:
508:
362:end-Campanian-Maastrichtian event
225:. It possibly continues into the
200:Gout-Rossignol-LĂ©guillac Syncline
425:Feuille Nontron. BRGM, Orléans.
20:
163:and continues to the north of
130:The anticline was named after
1:
415:
118:Description of the structure
7:
291:-bearing limestones of the
10:
513:
406:South Armorican Shear Zone
410:La Tour-Blanche Anticline
204:La Tour-Blanche Anticline
92:Mareuil-Meyssac Anticline
390:Saint-Martial-de-Valette
251:fossiliferous limestones
29:This article includes a
396:Structural observations
330:cannot be ascertained.
144:Sainte-Croix-de-Mareuil
58:more precise citations.
433:Aquitaine Occidentale.
343:
127:
341:
264:consisting of green,
125:
431:Vigneaux M. (1975).
98:of the northeastern
96:sedimentary sequence
464: /
384:, maybe even under
421:Floc'h JP, et al.
382:compressive forces
344:
159:, which starts at
128:
31:list of references
497:Geology of France
402:anticlinal ridges
368:event during the
229:or even into the
161:La Rochebeaucourt
88:Mareuil Anticline
84:
83:
76:
504:
479:
478:
476:
475:
474:
469:
468:45.467°N 0.417°E
465:
462:
461:
460:
457:
446:
428:
334:Age of movements
231:Souillac flexure
227:Lacassagne Fault
186:Regional geology
112:Upper Cretaceous
79:
72:
68:
65:
59:
54:this article by
45:inline citations
24:
23:
16:
512:
511:
507:
506:
505:
503:
502:
501:
482:
481:
472:
470:
466:
463:
458:
455:
453:
451:
450:
444:
435:Masson, Paris.
426:
418:
398:
356:and during the
336:
239:
188:
120:
100:Aquitaine Basin
80:
69:
63:
60:
49:
35:related reading
25:
21:
12:
11:
5:
510:
500:
499:
494:
448:
447:
429:
417:
414:
397:
394:
335:
332:
326:underlies the
303:, glauconitic
243:Upper Jurassic
238:
235:
192:Massif Central
187:
184:
119:
116:
106:was caused by
90:, also called
82:
81:
39:external links
28:
26:
19:
9:
6:
4:
3:
2:
509:
498:
495:
493:
490:
489:
487:
480:
477:
473:45.467; 0.417
442:
441:2-225-41118-2
438:
434:
430:
424:
420:
419:
413:
411:
407:
403:
393:
391:
387:
386:transpression
383:
379:
375:
371:
367:
363:
359:
358:Maastrichtian
355:
350:
340:
331:
329:
325:
321:
317:
313:
308:
306:
302:
298:
294:
290:
286:
282:
278:
274:
270:
267:
263:
260:
259:transgressive
256:
252:
248:
244:
234:
232:
228:
224:
220:
216:
212:
207:
205:
201:
197:
193:
183:
181:
177:
172:
170:
167:. Along this
166:
162:
158:
157:Mareuil Fault
153:
149:
145:
141:
137:
133:
124:
115:
113:
109:
105:
101:
97:
93:
89:
78:
75:
67:
57:
53:
47:
46:
40:
36:
32:
27:
18:
17:
449:
432:
422:
401:
399:
361:
345:
309:
247:Kimmeridgian
240:
230:
226:
208:
199:
195:
189:
173:
156:
129:
91:
87:
85:
70:
61:
50:Please help
42:
471: /
445:(in French)
427:(in French)
275:and sandy,
266:glauconitic
215:Isle de Yeu
64:August 2012
56:introducing
492:Anticlines
486:Categories
416:References
262:Cenomanian
180:shear zone
148:Cenomanian
374:Oligocene
354:Campanian
320:Bathonian
312:Oxfordian
305:Santonian
297:Coniacian
293:Angoumian
277:alveoline
219:Terrasson
211:AngoulĂŞme
104:anticline
378:Pyrenees
366:orogenic
316:Bajocian
287:and the
285:Ligérian
281:Turonian
271:rich in
255:micrites
165:BrantĂ´me
152:Turonian
136:Dordogne
108:tectonic
456:45°28′N
376:in the
273:oysters
223:Meyssac
132:Mareuil
52:improve
459:0°25′E
439:
370:Eocene
349:slumps
328:Dogger
301:chalky
289:rudist
176:Riedel
140:France
269:marls
169:fault
37:, or
437:ISBN
324:Lias
318:and
86:The
392:).
221:to
213:to
488::
443:.
314:,
233:.
182:.
138:,
114:.
41:,
33:,
372:/
360:(
253:(
245:(
150:/
77:)
71:(
66:)
62:(
48:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
