Peter Weigand discusses the occurrence of Poway clasts in the upper Eocene part of the Sespe Formation at Stop 17 in the Santa Ana Mountains. Roadcut in the background along
Santiago Canyon Road exposes channel conglomerate deposits in the Sespe Formation that occur just above the Eocene Santiago Formation.
Ivan Colburn discusses the general geology of the Santa Ana Mountains at Stop 18 east of Silverado in the Santa Ana Mountains.
Left to right, Butch Trembly, Syrus Parvizian, Frank Denison, and J.R. Morgan look at exposures of the Middle Jurassic Bedford Canyon Formation along Silverado Creek at Stop 18 in the Santa Ana Mountains.
Close-up photograph of the Middle Jurassic Bedford Canyon Formation along Silverado Creek at Stop 18 in the Santa Ana Mountains. Note the similarity between this unit and the Upper Jurassic Santa Monica Formation seen at Stop 5 on Day 1 of the trip.
Ivan Colburn discusses the significance of the Upper Cretaceous Trabuco Formation in the village of Silverado at Stop 19 in the Santa Ana Mountains.
Close-up photograph of the Upper Cretaceous Trabuco Formation in the village of Silverado at Stop 19 in the Santa Ana Mountains.
Lunchtime along Silverado Creek at Stop 20 in the Santa Ana Mountains.
Close-up picture of the basal conglomerate of the Paleocene Silverado Formation at Stop 20 along Silverado Creek in the Santa Ana Mountains.
Close-up of iron pisolites in the Paleocene Silverado Formation at Stop 20 along Silverado Creek in the Santa Ana Mountains.
Peter Weigand demonstrates a model of the extension hypothesis for development of the California Inner Borderland.
Peter Weigand demonstrates a model of the eduction hypothesis for development of the California Inner Borderland.
Trip participants study a stream-bottom exposure of the Paleocene-Eocene Santiago Formation exposed in Silverado Creek at Stop 21 in the Santa Ana Mountains.
Ivan Colburn summarizes the days activities for the group as they sit on a stream-bottom exposure of the Paleocene-Eocene Santiago Formation exposed in Silverado Creek at Stop 21 in the Santa Ana Mountains.
Ivan Colburn discusses the general geology of the Santa Ana Mountains at Stop 18 east of Silverado in the Santa Ana Mountains.
Left to right, Butch Trembly, Syrus Parvizian, Frank Denison, and J.R. Morgan look at exposures of the Middle Jurassic Bedford Canyon Formation along Silverado Creek at Stop 18 in the Santa Ana Mountains.
Close-up photograph of the Middle Jurassic Bedford Canyon Formation along Silverado Creek at Stop 18 in the Santa Ana Mountains. Note the similarity between this unit and the Upper Jurassic Santa Monica Formation seen at Stop 5 on Day 1 of the trip.
Ivan Colburn discusses the significance of the Upper Cretaceous Trabuco Formation in the village of Silverado at Stop 19 in the Santa Ana Mountains.
Close-up photograph of the Upper Cretaceous Trabuco Formation in the village of Silverado at Stop 19 in the Santa Ana Mountains.
Lunchtime along Silverado Creek at Stop 20 in the Santa Ana Mountains.
Close-up picture of the basal conglomerate of the Paleocene Silverado Formation at Stop 20 along Silverado Creek in the Santa Ana Mountains.
Close-up of iron pisolites in the Paleocene Silverado Formation at Stop 20 along Silverado Creek in the Santa Ana Mountains.
Peter Weigand demonstrates a model of the extension hypothesis for development of the California Inner Borderland.
Peter Weigand demonstrates a model of the eduction hypothesis for development of the California Inner Borderland.
Trip participants study a stream-bottom exposure of the Paleocene-Eocene Santiago Formation exposed in Silverado Creek at Stop 21 in the Santa Ana Mountains.
Ivan Colburn summarizes the days activities for the group as they sit on a stream-bottom exposure of the Paleocene-Eocene Santiago Formation exposed in Silverado Creek at Stop 21 in the Santa Ana Mountains.
Left to right, Butch Trembly, Syrus Parvizian, Frank Denison, and J.R. Morgan look at exposures of the Middle Jurassic Bedford Canyon Formation along Silverado Creek at Stop 18 in the Santa Ana Mountains.
Close-up photograph of the Middle Jurassic Bedford Canyon Formation along Silverado Creek at Stop 18 in the Santa Ana Mountains. Note the similarity between this unit and the Upper Jurassic Santa Monica Formation seen at Stop 5 on Day 1 of the trip.
Ivan Colburn discusses the significance of the Upper Cretaceous Trabuco Formation in the village of Silverado at Stop 19 in the Santa Ana Mountains.
Close-up photograph of the Upper Cretaceous Trabuco Formation in the village of Silverado at Stop 19 in the Santa Ana Mountains.
Lunchtime along Silverado Creek at Stop 20 in the Santa Ana Mountains.
Close-up picture of the basal conglomerate of the Paleocene Silverado Formation at Stop 20 along Silverado Creek in the Santa Ana Mountains.
Close-up of iron pisolites in the Paleocene Silverado Formation at Stop 20 along Silverado Creek in the Santa Ana Mountains.
Peter Weigand demonstrates a model of the extension hypothesis for development of the California Inner Borderland.
Peter Weigand demonstrates a model of the eduction hypothesis for development of the California Inner Borderland.
Trip participants study a stream-bottom exposure of the Paleocene-Eocene Santiago Formation exposed in Silverado Creek at Stop 21 in the Santa Ana Mountains.
Ivan Colburn summarizes the days activities for the group as they sit on a stream-bottom exposure of the Paleocene-Eocene Santiago Formation exposed in Silverado Creek at Stop 21 in the Santa Ana Mountains.
Close-up photograph of the Middle Jurassic Bedford Canyon Formation along Silverado Creek at Stop 18 in the Santa Ana Mountains. Note the similarity between this unit and the Upper Jurassic Santa Monica Formation seen at Stop 5 on Day 1 of the trip.
Ivan Colburn discusses the significance of the Upper Cretaceous Trabuco Formation in the village of Silverado at Stop 19 in the Santa Ana Mountains.
Close-up photograph of the Upper Cretaceous Trabuco Formation in the village of Silverado at Stop 19 in the Santa Ana Mountains.
Lunchtime along Silverado Creek at Stop 20 in the Santa Ana Mountains.
Close-up picture of the basal conglomerate of the Paleocene Silverado Formation at Stop 20 along Silverado Creek in the Santa Ana Mountains.
Close-up of iron pisolites in the Paleocene Silverado Formation at Stop 20 along Silverado Creek in the Santa Ana Mountains.
Peter Weigand demonstrates a model of the extension hypothesis for development of the California Inner Borderland.
Peter Weigand demonstrates a model of the eduction hypothesis for development of the California Inner Borderland.
Trip participants study a stream-bottom exposure of the Paleocene-Eocene Santiago Formation exposed in Silverado Creek at Stop 21 in the Santa Ana Mountains.
Ivan Colburn summarizes the days activities for the group as they sit on a stream-bottom exposure of the Paleocene-Eocene Santiago Formation exposed in Silverado Creek at Stop 21 in the Santa Ana Mountains.
Ivan Colburn discusses the significance of the Upper Cretaceous Trabuco Formation in the village of Silverado at Stop 19 in the Santa Ana Mountains.
Close-up photograph of the Upper Cretaceous Trabuco Formation in the village of Silverado at Stop 19 in the Santa Ana Mountains.
Lunchtime along Silverado Creek at Stop 20 in the Santa Ana Mountains.
Close-up picture of the basal conglomerate of the Paleocene Silverado Formation at Stop 20 along Silverado Creek in the Santa Ana Mountains.
Close-up of iron pisolites in the Paleocene Silverado Formation at Stop 20 along Silverado Creek in the Santa Ana Mountains.
Peter Weigand demonstrates a model of the extension hypothesis for development of the California Inner Borderland.
Peter Weigand demonstrates a model of the eduction hypothesis for development of the California Inner Borderland.
Trip participants study a stream-bottom exposure of the Paleocene-Eocene Santiago Formation exposed in Silverado Creek at Stop 21 in the Santa Ana Mountains.
Ivan Colburn summarizes the days activities for the group as they sit on a stream-bottom exposure of the Paleocene-Eocene Santiago Formation exposed in Silverado Creek at Stop 21 in the Santa Ana Mountains.
Close-up photograph of the Upper Cretaceous Trabuco Formation in the village of Silverado at Stop 19 in the Santa Ana Mountains.
Lunchtime along Silverado Creek at Stop 20 in the Santa Ana Mountains.
Close-up picture of the basal conglomerate of the Paleocene Silverado Formation at Stop 20 along Silverado Creek in the Santa Ana Mountains.
Close-up of iron pisolites in the Paleocene Silverado Formation at Stop 20 along Silverado Creek in the Santa Ana Mountains.
Peter Weigand demonstrates a model of the extension hypothesis for development of the California Inner Borderland.
Peter Weigand demonstrates a model of the eduction hypothesis for development of the California Inner Borderland.
Trip participants study a stream-bottom exposure of the Paleocene-Eocene Santiago Formation exposed in Silverado Creek at Stop 21 in the Santa Ana Mountains.
Ivan Colburn summarizes the days activities for the group as they sit on a stream-bottom exposure of the Paleocene-Eocene Santiago Formation exposed in Silverado Creek at Stop 21 in the Santa Ana Mountains.
Lunchtime along Silverado Creek at Stop 20 in the Santa Ana Mountains.
Close-up picture of the basal conglomerate of the Paleocene Silverado Formation at Stop 20 along Silverado Creek in the Santa Ana Mountains.
Close-up of iron pisolites in the Paleocene Silverado Formation at Stop 20 along Silverado Creek in the Santa Ana Mountains.
Peter Weigand demonstrates a model of the extension hypothesis for development of the California Inner Borderland.
Peter Weigand demonstrates a model of the eduction hypothesis for development of the California Inner Borderland.
Trip participants study a stream-bottom exposure of the Paleocene-Eocene Santiago Formation exposed in Silverado Creek at Stop 21 in the Santa Ana Mountains.
Ivan Colburn summarizes the days activities for the group as they sit on a stream-bottom exposure of the Paleocene-Eocene Santiago Formation exposed in Silverado Creek at Stop 21 in the Santa Ana Mountains.
Close-up picture of the basal conglomerate of the Paleocene Silverado Formation at Stop 20 along Silverado Creek in the Santa Ana Mountains.
Close-up of iron pisolites in the Paleocene Silverado Formation at Stop 20 along Silverado Creek in the Santa Ana Mountains.
Peter Weigand demonstrates a model of the extension hypothesis for development of the California Inner Borderland.
Peter Weigand demonstrates a model of the eduction hypothesis for development of the California Inner Borderland.
Trip participants study a stream-bottom exposure of the Paleocene-Eocene Santiago Formation exposed in Silverado Creek at Stop 21 in the Santa Ana Mountains.
Ivan Colburn summarizes the days activities for the group as they sit on a stream-bottom exposure of the Paleocene-Eocene Santiago Formation exposed in Silverado Creek at Stop 21 in the Santa Ana Mountains.
Close-up of iron pisolites in the Paleocene Silverado Formation at Stop 20 along Silverado Creek in the Santa Ana Mountains.
Peter Weigand demonstrates a model of the extension hypothesis for development of the California Inner Borderland.
Peter Weigand demonstrates a model of the eduction hypothesis for development of the California Inner Borderland.
Trip participants study a stream-bottom exposure of the Paleocene-Eocene Santiago Formation exposed in Silverado Creek at Stop 21 in the Santa Ana Mountains.
Ivan Colburn summarizes the days activities for the group as they sit on a stream-bottom exposure of the Paleocene-Eocene Santiago Formation exposed in Silverado Creek at Stop 21 in the Santa Ana Mountains.
Peter Weigand demonstrates a model of the extension hypothesis for development of the California Inner Borderland.
Peter Weigand demonstrates a model of the eduction hypothesis for development of the California Inner Borderland.
Trip participants study a stream-bottom exposure of the Paleocene-Eocene Santiago Formation exposed in Silverado Creek at Stop 21 in the Santa Ana Mountains.
Ivan Colburn summarizes the days activities for the group as they sit on a stream-bottom exposure of the Paleocene-Eocene Santiago Formation exposed in Silverado Creek at Stop 21 in the Santa Ana Mountains.
Peter Weigand demonstrates a model of the eduction hypothesis for development of the California Inner Borderland.
Trip participants study a stream-bottom exposure of the Paleocene-Eocene Santiago Formation exposed in Silverado Creek at Stop 21 in the Santa Ana Mountains.
Ivan Colburn summarizes the days activities for the group as they sit on a stream-bottom exposure of the Paleocene-Eocene Santiago Formation exposed in Silverado Creek at Stop 21 in the Santa Ana Mountains.
Trip participants study a stream-bottom exposure of the Paleocene-Eocene Santiago Formation exposed in Silverado Creek at Stop 21 in the Santa Ana Mountains.
Ivan Colburn summarizes the days activities for the group as they sit on a stream-bottom exposure of the Paleocene-Eocene Santiago Formation exposed in Silverado Creek at Stop 21 in the Santa Ana Mountains.