Home » Places Thunder Rocks at Allegany State Park Thunder Rocks is a rock city that is located in Allegany State Park. It is made up of huge rocks that you can observe, walk up to, and even climb. It is a great place to visit with your family or to study the geologic history of New York. The geology of Thunder Rocks is very interesting and the creation of this large rock city is unique. Most people believe that glaciers were the reason Thunder Rocks appeared, but this is not true. Instead, the giant rocks were made due to a number of things. A long time ago (about 360 million years ago) New York State, along with Allegany State Park was covered by a large, shallow sea. The nearby Catskill Mountains were formed to the east during this time. Sediment from these mountains eroded westward towards western New York and deposited within this area. Thunder Rocks is made up of this sediment. Over some time, frost wedging and gravity erosion shaped the boulders into their present arrangement. Gravity was able to pull the large rocks down some slopes and hills. This resulted in the rocks being scattered away from each other. While this is the most accurate evidence of how Thunder Rocks formed, some people still think glaciers caused their appearance. But this can not be true because Allegany State Park is part of what is called the Salamanca Re-entrant. This is a small area of New York State that has been untouched by glaciers. Thunder Rocks is also included in this area. This means glaciers were definitely not the reason for their formation. The process that occurred throughout New York’s geologic history is very interesting, especially when it comes to the history of Thunder Rocks. This makes it all the more reason to visit these uniquely huge slabs of bedrock! Information compiled by Riley Brumagin and Owen Dudley 5/31/2012 for the Cattaraugus County Geology Trail Photos Tree growing up rocks at Thunder Rocks at Allegany State Park Standing in front of giant rock at Thunder Rocks at Allegany State Park Maps & Coordinates Coordinates: 42°02′32.5″N 78°42′05.5″W View/Download the Allegany State Park Visitors Map. The red area on the map represents the Salamanca Re-entrant. This is the only area of New York State that has been untouched by glaciers. Visit the following site to see an accurate plot of this area on a map: http://www.zeemaps.com/pub?group=368349&x=-78.701534&y=44.116457&z=11 Old Allegany State Park Guide Map showing how to get to Thunder Rocks from Salamanca Thunder Rocks in Allegany State Park NY United States 42° 2' 32.4996" N, 78° 42' 5.5008" W General Information Wheelchair Accessible: Unknown Parking: Unknown RV Parking: Unknown Bus Parking: Unknown Pets Allowed: Unknown Accepts Credit Cards: Unknown Internet Access: Unknown Conference / Meeting / Banquet: Unknown Indoor Pool: Unknown Outdoor Pool: Unknown Swimming: Boat Launch or Dock: Fishing Access: Equestrian Trail Access: Unknown Bicycle Trail Access: Unknown Hiking Trail Access: Unknown Mountain Biking Trail Access: Unknown Snowmobile Trail Access: Unknown Please note Please note that this information may change and may be incorrect Thunder Rocks at Allegany State Park is categorized in Autumn Spring Summer Winter Hiking Mountain Biking Skiing Cross Country Snowmobiling geology Adventure Seekers Nature Lovers Red House Salamanca Printer-friendly version Email this page Travel Guide It's a full 56-page comprehensive guide, highlighting the activities and attractions in our County and it's FREE!! View the visitor's guide online or request that the Enchanted Mountains guide be snail mailed to you for FREE! Related Events Take a Hike with Pfeiffer Nature Center Holiday Valley's 2016/2017 New Years Eve Celebration and Torchlight Parade 2017 Sportsman's Show at Seneca Allegany Events Center Olean Area Outdoor & Rec Sports Show 2017 Friends of Good Music presents "Murder on the Nile"