308:
296:. The water increases in acidity as it percolates through the topsoil then dissolves the underlying chalk. Eventually there is nothing but topsoil above the caverns so formed and the familiar shape of a doline is created when the topsoil collapses into the cavern beneath. Dolines are usually shaped like a teardrop cut in half vertically and laid down horizontally. Within 1,000 m (1,100 yd) of the monument there are three dolines which were formed by the chalk being dissolved in a vertical fissure in its structure. These dolines are vertically sided and are shaped like wells. The two which opened up in 1956 are some 100 m (330 ft) deep. The one which opened in 2006 is not quite vertical and its depth is unknown.
35:
251:
307:
169:
101:
369:
262:
70:
221:
163:
94:
266:
216:
The treeless summit of Black Down is a popular viewing point, crowned by the 72 foot (22 m) high
406:
34:
60:
198:
364:
284:
The ground around the monument is pitted with various holes and craters. Many of these are
8:
229:
385:
240:
156:
82:
336:
278:
17:
350:
373:
182:
177:
225:
217:
149:
400:
116:
103:
75:
289:
236:
244:
87:
258:
202:
285:
293:
210:
206:
141:
50:
201:
about 1.2 miles (2 km) north-northeast of the village of
292:. These are formed when rain falls on the highly acidic
390:
at www.worldheritagecoast.net. Accessed on 26 Mar 2013.
281:. The gravel beds extend to the east as far as London.
355:
at www.nationaltrust.org.uk. Accessed on 26 Mar 2013.
269:
decided that the geology of the area was very rare.
277:Geologically, Black Down is the western tip of the
376:at www.dorsetaonb.org.uk. Accessed on 26 Mar 2013.
261:area around the monument was in 1984 designated a
341:by Jonathan de Ferranti. Accessed on 26 Mar 2013.
213:and around 3.1 miles (5 km) from the coast.
398:
313:Road from Martinstown to Black Down (far right)
235:From the top there are views of the Fleet and
222:Vice-Admiral Sir Thomas Masterman Hardy
399:
332:
330:
328:
247:may be visible, some 50 miles away.
263:Site of Special Scientific Interest
13:
338:Summit Listings by Relative Height
14:
418:
325:
39:Black Down and the Hardy Monument
306:
33:
379:
358:
352:Monument to Vice-Admiral Hardy
344:
1:
366:Hardy Monument and Black Down
318:
7:
220:built in 1844 in memory of
10:
423:
299:
272:
267:Nature Conservancy Council
15:
250:The site is owned by the
176:
162:
148:
137:
132:
93:
81:
69:
59:
49:
44:
32:
27:
55:242 m (794 ft)
228:'s Flag Captain at the
65:78 m (256 ft)
199:South Dorset Ridgeway
16:For the village, see
279:Bagshot gravel beds
230:Battle of Trafalgar
113: /
372:2016-03-04 at the
241:South Dorset Downs
157:South Dorset Downs
45:Highest point
205:in the county of
197:is a hill on the
192:
191:
18:Blackdown, Dorset
414:
391:
387:Hardy's Monument
383:
377:
362:
356:
348:
342:
334:
310:
243:. On a fine day
172:
152:
128:
127:
125:
124:
123:
118:
117:50.687°N 2.551°W
114:
111:
110:
109:
106:
37:
25:
24:
422:
421:
417:
416:
415:
413:
412:
411:
407:Hills of Dorset
397:
396:
395:
394:
384:
380:
374:Wayback Machine
363:
359:
349:
345:
335:
326:
321:
314:
311:
302:
275:
239:as well as the
168:
150:
121:
119:
115:
112:
107:
104:
102:
100:
99:
40:
21:
12:
11:
5:
420:
410:
409:
393:
392:
378:
357:
343:
323:
322:
320:
317:
316:
315:
312:
305:
301:
298:
274:
271:
252:National Trust
226:Admiral Nelson
218:Hardy Monument
190:
189:
180:
174:
173:
166:
160:
159:
154:
146:
145:
139:
135:
134:
130:
129:
122:50.687; -2.551
97:
91:
90:
85:
79:
78:
73:
67:
66:
63:
57:
56:
53:
47:
46:
42:
41:
38:
30:
29:
9:
6:
4:
3:
2:
419:
408:
405:
404:
402:
389:
388:
382:
375:
371:
368:
367:
361:
354:
353:
347:
340:
339:
333:
331:
329:
324:
309:
304:
303:
297:
295:
291:
290:swallow holes
287:
282:
280:
270:
268:
264:
260:
255:
253:
248:
246:
242:
238:
233:
231:
227:
223:
219:
214:
212:
208:
204:
200:
196:
187:
184:
181:
179:
175:
171:
167:
165:
161:
158:
155:
153:
147:
143:
140:
136:
131:
126:
98:
96:
92:
89:
86:
84:
80:
77:
76:Lewesdon Hill
74:
72:
68:
64:
62:
58:
54:
52:
48:
43:
36:
31:
26:
23:
19:
386:
381:
365:
360:
351:
346:
337:
283:
276:
256:
249:
237:Chesil Beach
234:
215:
194:
193:
185:
151:Parent range
22:
265:, when the
245:The Needles
120: /
95:Coordinates
88:Tump (hill)
71:Parent peak
319:References
195:Black Down
186:Landranger
105:50°41′13″N
61:Prominence
28:Black Down
259:heathland
203:Portesham
144:, England
133:Geography
108:2°33′04″W
51:Elevation
401:Category
370:Archived
224:who was
178:Topo map
170:SY611876
138:Location
300:Gallery
294:topsoil
286:dolines
273:Geology
211:England
164:OS grid
83:Listing
207:Dorset
142:Dorset
257:The
288:or
188:194
403::
327:^
254:.
232:.
209:,
183:OS
20:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
