| Name | Borehole No 21, Ida-Virumaa |
| Number | 21 |
| Type | borehole (section) |
| Country | Estonia |
| Parish | Vaivara |
| Settlement | Auvere |
| Elevation | 32.20 |
| Coordinates | 59.343788, 27.932108 |
| Location remarks | Kuskil Kirde Eestis, võimalik et Narva ümbrusest. Proov kogutud Erisalu, E. poolt 1959. Vaivara 21? (Ivo) Puurauk 21 Tallinn-Narva mnt-st lõuna pool, Hiiemetsast lõunasse suunduva tee ääres (u 3.8 km Tln-Narva mnt-lt). Auverest ca 1.1 km lääne-edelas. Vaivarast on puuraugu asukoht 9.5-9.7 km ida-kagus. |
| Strat. top | Kõrgekallas Formation |
| Strat. base | Upper Cambrian (old nomenclature) |
| Remarks | Kas Vaivara 21 puurauk? Stumbur, K., Jõgi, S. jt kaardistamine 1958-59. EGF 1286. |
| Date added | 2011-07-24 |
| Date changed | 2019-07-01 |
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