883:
155:
112:
148:
26:
105:
60:
247:
and the other at Round Top itself. Over time, the Round Top vent has tilted and fallen sideways, a testament to the geological changes that have shaped the region over millions of years.
243:
The volcanic activity that created Round Top started around 10.2 Million years ago and continued for over a million years. The area has two known main volcanic vents: one under the
978:
924:
953:
973:
443:
958:
963:
296:
261:
713:
917:
683:
968:
708:
698:
393:
256:
147:
790:
775:
910:
780:
678:
658:
436:
244:
45:
765:
300:
770:
602:
384:
693:
668:
104:
898:
637:
587:
237:
943:
785:
612:
429:
233:
890:
739:
632:
627:
597:
516:
452:
389:
225:
200:
124:
703:
688:
653:
617:
531:
506:
240:
in 1958 in honor of Robert Sibley, the second president of the park district, shortly after his death in 1958.
718:
663:
622:
551:
379:
292:
592:
571:
566:
546:
496:
471:
53:
806:
228:. The peak is part of the Sibley Volcanic Regional Preserve, which was originally established in 1936 as
723:
837:
832:
607:
511:
491:
852:
811:
749:
526:
486:
541:
948:
857:
827:
673:
501:
556:
882:
536:
476:
284:
842:
561:
8:
521:
221:
324:
744:
350:
481:
213:
195:
25:
894:
217:
181:
937:
862:
847:
466:
132:
75:
62:
188:
421:
128:
407:
38:
232:This park was one of the first three parks in the
935:
979:Contra Costa County, California geography stubs
297:National Oceanic and Atmospheric Administration
918:
437:
262:List of summits of the San Francisco Bay Area
954:Landforms of Contra Costa County, California
451:
925:
911:
444:
430:
348:
974:Parks in Contra Costa County, California
394:United States Department of the Interior
257:Robert Sibley Volcanic Regional Preserve
959:Mountains of the San Francisco Bay Area
863:Breuner Marsh (now Dotson Family Marsh)
318:
316:
964:Extinct volcanoes of the United States
936:
425:
349:Rademacher, Horst (January 6, 2012).
322:
279:
277:
245:Lawrence Berkeley National Laboratory
877:
313:
301:United States Department of Commerce
408:"Sibley Volcanic Regional Preserve"
385:Geographic Names Information System
13:
410:. East Bay Regional Parks District
274:
14:
990:
372:
238:Sibley Volcanic Regional Preserve
154:
111:
881:
234:East Bay Regional Parks District
153:
146:
110:
103:
24:
969:East Bay Regional Park District
891:Contra Costa County, California
390:United States Geological Survey
342:
323:Slack, Gordy (April 1, 2005).
76:37.850084094°N 122.192822678°W
1:
267:
170:Show map of the United States
167:Round Top (the United States)
897:. You can help Knowledge by
81:37.850084094; -122.192822678
7:
250:
10:
995:
876:
838:Crown Memorial State Beach
43:1,764 ft (538 m)
853:Little Hills Picnic Ranch
820:
799:
758:
732:
646:
580:
459:
194:
180:
96:
91:
52:
37:
32:
23:
18:
293:National Geodetic Survey
230:Round Top Regional Park.
944:Volcanoes of California
858:Point Molate Beach Park
828:Ardenwood Historic Farm
453:East Bay Regional Parks
236:. The park was renamed
893:–related article is a
613:Martin Luther King Jr.
325:"Voice of the Volcano"
137:Show map of California
647:Preserves/open spaces
351:"From the Inside Out"
843:Eastshore State Park
659:Black Diamond Mines
226:Contra Costa County
222:Oakland, California
125:Contra Costa County
72: /
46: NAVD 88
33:Highest point
906:
905:
871:
870:
517:Dry Creek Pioneer
207:
206:
48:
986:
927:
920:
913:
885:
878:
759:Recreation areas
733:Wilderness areas
694:Morgan Territory
669:Claremont Canyon
603:Carquinez Strait
532:Pleasanton Ridge
507:Diablo Foothills
446:
439:
432:
423:
422:
418:
416:
415:
403:
401:
400:
366:
365:
363:
361:
346:
340:
339:
337:
335:
320:
311:
310:
308:
307:
281:
184:
171:
157:
156:
150:
138:
114:
113:
107:
87:
86:
84:
83:
82:
77:
73:
70:
69:
68:
65:
44:
28:
16:
15:
994:
993:
989:
988:
987:
985:
984:
983:
934:
933:
932:
931:
874:
872:
867:
816:
795:
754:
728:
714:Sycamore Valley
642:
576:
552:Tassajara Ridge
455:
450:
413:
411:
406:
398:
396:
378:
375:
370:
369:
359:
357:
347:
343:
333:
331:
321:
314:
305:
303:
283:
282:
275:
270:
253:
220:, just east of
216:located in the
214:extinct volcano
182:
176:
175:
174:
173:
172:
169:
168:
165:
164:
163:
162:
158:
141:
140:
139:
136:
135:
122:
121:
120:
119:
115:
80:
78:
74:
71:
66:
63:
61:
59:
58:
12:
11:
5:
992:
982:
981:
976:
971:
966:
961:
956:
951:
949:Berkeley Hills
946:
930:
929:
922:
915:
907:
904:
903:
886:
869:
868:
866:
865:
860:
855:
850:
845:
840:
835:
830:
824:
822:
818:
817:
815:
814:
809:
803:
801:
797:
796:
794:
793:
788:
783:
778:
773:
768:
762:
760:
756:
755:
753:
752:
747:
742:
736:
734:
730:
729:
727:
726:
721:
716:
711:
709:Sobrante Ridge
706:
701:
696:
691:
686:
681:
676:
671:
666:
661:
656:
650:
648:
644:
643:
641:
640:
638:Radke Martinez
635:
630:
625:
620:
615:
610:
605:
600:
595:
590:
588:Antioch/Oakley
584:
582:
578:
577:
575:
574:
572:Wildcat Canyon
569:
567:Vargas Plateau
564:
559:
554:
549:
547:Sobrante Ridge
544:
539:
534:
529:
524:
519:
514:
509:
504:
499:
497:Crockett Hills
494:
489:
484:
479:
474:
472:Anthony Chabot
469:
463:
461:
457:
456:
449:
448:
441:
434:
426:
420:
419:
404:
374:
373:External links
371:
368:
367:
341:
312:
289:NGS Data Sheet
272:
271:
269:
266:
265:
264:
259:
252:
249:
218:Berkeley Hills
205:
204:
198:
192:
191:
186:
178:
177:
166:
160:
159:
152:
151:
145:
144:
143:
142:
123:
117:
116:
109:
108:
102:
101:
100:
99:
98:
97:
94:
93:
89:
88:
56:
50:
49:
41:
35:
34:
30:
29:
21:
20:
9:
6:
4:
3:
2:
991:
980:
977:
975:
972:
970:
967:
965:
962:
960:
957:
955:
952:
950:
947:
945:
942:
941:
939:
928:
923:
921:
916:
914:
909:
908:
902:
900:
896:
892:
887:
884:
880:
879:
875:
864:
861:
859:
856:
854:
851:
849:
848:Hoffman Marsh
846:
844:
841:
839:
836:
834:
833:Browns Island
831:
829:
826:
825:
823:
819:
813:
810:
808:
807:Alameda Creek
805:
804:
802:
798:
792:
791:Shadow Cliffs
789:
787:
784:
782:
779:
777:
776:Kennedy Grove
774:
772:
769:
767:
764:
763:
761:
757:
751:
748:
746:
743:
741:
738:
737:
735:
731:
725:
722:
720:
717:
715:
712:
710:
707:
705:
702:
700:
697:
695:
692:
690:
687:
685:
682:
680:
677:
675:
672:
670:
667:
665:
662:
660:
657:
655:
652:
651:
649:
645:
639:
636:
634:
631:
629:
626:
624:
621:
619:
616:
614:
611:
609:
606:
604:
601:
599:
598:Brooks Island
596:
594:
591:
589:
586:
585:
583:
579:
573:
570:
568:
565:
563:
560:
558:
555:
553:
550:
548:
545:
543:
540:
538:
535:
533:
530:
528:
525:
523:
520:
518:
515:
513:
510:
508:
505:
503:
500:
498:
495:
493:
490:
488:
485:
483:
480:
478:
475:
473:
470:
468:
467:Alvarado Park
465:
464:
462:
458:
454:
447:
442:
440:
435:
433:
428:
427:
424:
409:
405:
395:
391:
387:
386:
381:
377:
376:
356:
352:
345:
330:
326:
319:
317:
302:
298:
294:
290:
286:
280:
278:
273:
263:
260:
258:
255:
254:
248:
246:
241:
239:
235:
231:
227:
223:
219:
215:
211:
202:
199:
197:
193:
190:
187:
185:
179:
149:
134:
130:
126:
106:
95:
90:
85:
57:
55:
51:
47:
42:
40:
36:
31:
27:
22:
17:
899:expanding it
888:
873:
781:Quarry Lakes
704:Round Valley
689:Mission Peak
684:Leona Canyon
674:Five Canyons
654:Bishop Ranch
633:Point Pinole
628:Point Isabel
512:Dublin Hills
492:Coyote Hills
412:. Retrieved
397:. Retrieved
383:
358:. Retrieved
354:
344:
332:. Retrieved
328:
304:. Retrieved
288:
242:
229:
209:
208:
203:Oakland East
189:Diablo Range
183:Parent range
766:Cull Canyon
740:Las Trampas
719:Vasco Caves
679:Huckleberry
664:Brushy Peak
618:Miller/Knox
527:Lake Chabot
487:Contra Loma
482:Castle Rock
380:"Round Top"
285:"Round Top"
79: /
67:122°11′34″W
54:Coordinates
938:Categories
812:Iron Horse
771:Don Castro
623:Oyster Bay
581:Shorelines
542:Ridgelands
414:2009-08-16
399:2009-08-16
355:Bay Nature
329:Bay Nature
306:2009-08-16
268:References
129:California
64:37°51′00″N
724:Waterbird
593:Big Break
502:Del Valle
360:April 19,
334:April 18,
224:, within
210:Round Top
161:Round Top
118:Round Top
92:Geography
39:Elevation
19:Round Top
557:Temescal
251:See also
196:Topo map
786:Roberts
608:Hayward
537:Redwood
477:Briones
800:Trails
745:Ohlone
699:Sibley
562:Tilden
212:is an
889:This
821:Other
750:Sunol
522:Garin
460:Parks
895:stub
362:2021
336:2021
201:USGS
133:U.S.
940::
392:,
388:.
382:.
353:.
327:.
315:^
299:,
295:,
291:.
287:.
276:^
131:,
127:,
926:e
919:t
912:v
901:.
445:e
438:t
431:v
417:.
402:.
364:.
338:.
309:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
