Often you may be driving through the Spanish Peaks region and not be aware of the many places along the road where dikes are visible. The following are just a couple examples of some dike - country rock contacts.
Figure 1 - Dike - Country Rock contact. Dike is on the right and the Poison Canyon formation is on the left. This is in the western portion of Jarosa Canyon.
Figure 2 - Another dike-country rock contact in the southern part of the Spanish Peak region.
Figure 3 - dike - country rock contact. Dike is in the middle with idurated Poison Canyon fm. on either side.
Figure 4 - This dike-country rock contact is found on the west side of the road just west of Monument Lake. The dike itself is a lamprophyre intruded into Pennsylvanian Sangre de Cristo formation.
Figure 5 - This is a picture taken from Bradford Mesa (sp51) east of I-25 and North of CO 10. This is pretty cool because this is all thats visible of the dike on top of the mesa.
Figure 6 - Subparallel dike contact on west side of I25 (just south of Holiday Inn) along service drive going to Starkville.
Figure 7 - Contact of Profile Rock (granodiorite) and sandstone of the Cuchara FM.