| Monmouth Creek complex | |
|---|---|
  Monmouth Creek complex | |
 | |
| Highest point | |
| Elevation | 510 m (1,670 ft) |
| Coordinates | 49°41′38″N123°11′49″W / 49.69389°N 123.19694°W /49.69389; -123.19694 |
| Geography | |
| Location | British Columbia,Canada |
| District | New Westminster Land District |
| Parent range | Pacific Ranges |
| Topo map | NTS 92G11Squamish |
| Geology | |
| Rock age | Unknown[1] |
| Volcanic arc | Cascade Volcanic Arc |
| Volcanic belt | Garibaldi Volcanic Belt |
| Volcanic field | Squamish volcanic field |
TheMonmouth Creek complex is a volcanic complex in southwesternBritish Columbia,Canada, located 4 km (2.5 mi) southwest of the community ofSquamish on the west side of theSquamish River mouth. It lies in the southernPacific Ranges of theCoast Mountains and is part of theSquamish volcanic field in the southernGaribaldi Volcanic Belt, which represents the northernmost extension of theCascade Volcanic Arc.
Its prominent and enigmatic edifice is composed ofbasaltic andesite todacite of unknown age and may represent a group ofdikes andlava domes that formed subglacially.[1] At least four dikes protrude its summit.[1][2] These form the ribs of 60 m (200 ft) to 180 m (590 ft) highlava spines, the tallest beingThe Castle, which contains horizontal and radiating columnar joints.[1] The spines are covered by welded breccia close to their bases and columnar jointing extends into the welded sequence.[1] The most elevated lava flows and spines are composed of dacite.[1]
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