What is an example of oceanic continental convergence?

At an ocean-continent convergent boundary, the denser oceanic plate is pushed under the less dense continental plate in the same manner as at an ocean-ocean boundary.

Examples of ocean-continent convergent boundaries are 

• Subduction of the Nazca Plate under South America which has created the Andes Mountains and the Peru Trench 
• Subduction of the Juan de Fuca Plate under North America created the Cascade Range.

Further Reading:

• Geomorphic Processes
• The Origin And The Evolution Of The Earth