Clear weather: 8 Â°C: 2 N: 60 % 08:00: Clear weather: 10 Â°C: 2 N: 62 % 11:00: Clear weather: 16 Â°C: 2 S: 47 % 14:00: Clear weather: 16 Â°C: 2 S: 51 % 17:00: Clear weather: 12 Â°C: 1 SW: 77 % 20:00: Clear weather: 11 Â°C: 1 NE: 59 % 23:00: Clear weather: 10 Â°C: 1 NE: 49 % Tuesday 09/01: 02:00: Clear weather: 10 Â°C: 1 NE: 43 % 05:00: Almost clear: 11 Â°C: 1 E: 43 % 08:00: Clear weather: 11 Â°C: 1 NW: 47 % 11:00: Clear weather: 16 Â°C: 2 S: 44 % 14:00: Clear weather: 16 Â°C: 2 S: 59 % 17:00: Clear weather: 12 Â°C: 1 SW: 81 % 20:00: Clear weather: 12 Â°C: 1 NE: 64 % 23:00: Clear weather: 11 Â°C: 2 NE: 55 % Wednesday 10/01: 02:00: Clear weather: 10 Â°C: 2 NE: 49 % 05:00
In cylindrica l folds the crest and trough lines are parallel. to the fold axis and to each other, but in conical folds the crest and trough lines are not. parallel. Crest and trough surfaces connect the crest and trough lines on successive. horizons.
A line drawn from the origin, perpendicular to the. tangent line gives the plunge amount and direction (Bengtson 1980). In a type I fold. (Fig. 5.6), the minimum plunge angle is that of the crest line and all other plunge lines. have greater plunge angles.