Episode Source Material: 

• GEOLOGY OF MASSACHUSETTS AND RHODE ISLAND - 184
• The American journal of science
• Rhode Island State Rock: Cumberlandite
• Cumberlandite Raw Cubes stone of Venus – Song of Stones
• GC51DR2 Only in Rhode Island (Earthcache) in Rhode Island, United States created by Twohig260
• Walking RI: Hunt for RI's rare state rock at Cumberland's Blackall/Ballou Preserve
• Cumberlandite - Cumberland, Rhode Island USA - Places of Geologic Significance on Waymarking.com
• Historic and Architectural Resources of Cumberland RI
• Avalonia
• Igneous Rocks.
• 2 Replies to “Igneous Rocks: How Are They Formed?”
• Intrusive rock | geology
• Gabbro
• Geology of Rhode Island
• Eastern Avalonia