Geologic Times Corporation

gtc & gtc rock shop locations

gtc rock shop

Our "Brick & Mortar" store at Francis Scott Key Mall, Frederick MD  & and online too soon!


GTc rock shop

GTC Rock Shop located within the Francis Scott Key Mall in Frederick, MD  conveniently located directly from the Barnes and Noble mall entrance and near Sears and Dick's Sporting Goods. All sales help support Geologic Times Corporations geosciences educational efforts

Store Hours: (until October 2nd)
Monday through Saturday: 11:00 to 7:00pm
Sunday: 12:00 to 6:00pm

Store Hours: (starting October 2nd)
Monday through Thursday: Open to the public 12:00 to 7:00pm
(Also open by confirmed appointment only Monday through Thursday from 11:00am to 11:45am for those that have health reasons that prevent them from being able to wear a mask, and for those that may have compromised immune systems that may prevent them from coming out when the public is present. Please use our contact form to request more information on how you can book an appointment)
Friday & Saturday: 11:00am to 8:00pm
Sunday: 12:00 to 6:00pm

Preferred method payment to reduce contact will be credit cards, but we will accept cash. Face masks/coverings MUST be worn AT ALL TIMES while within the store and social distancing must be maintained while in store. We ask for your complete compliance with this in order to minimize the health risks to both our staff and other customers. We will have signage posted to help our visitors comply.

We also have a online store too! (opening soon)

visit our GTC Rock shop on-line store

GTC Rock shop & Gem mine

at Clark's Elioak Farm, Ellicott City MD

Sadly due to COVID-19, and for safety reasons that we are in total agreement with, Clark’s Elioak Farm has significantly restricted the number of attendees that can enter the farm in a given day. That is not likely to change, and again, we fully understand and support the farms decision to do so. Those numbers alone likely will not allow us to reasonably recoup our daily operational expenses to open our gem mining activities, and under the circumstances, we simply cannot endure any additional losses right now. Further complicating things is the reduction in the number of participants we can have on the flumes by nearly 75% to maintain proper social distancing, the need to run the system with chemicals in the water to reduce the risk of the spread of the virus, and other factors. Overall, it’s just not looking good for this season for us at the farm, and that is a huge disappointment on an already challenging year for us where every potential dollar we could bring in is critical.

NOTICE: So many of you have been asking when we plan to open at the farm, and I hope you all know that if we reasonably could, then we would. We badly miss being at the farm and seeing you all! We still hold hope that we will be able to open for a few select dates at some point this season. However, for now our operations at our seasonal location within Clark’s Elioak Farm will sadly remain suspended until further notice. please check back for updates...

Gem & fossil mining at
Clark's elioak farm

We have over 100' of gem mining flumes and a number of ore options to choose from. We are open select weekends only, so click on the link below to see what we will be at the farm next!


Geode cracking and retail sales
at Clark's elioak farm

We have a number of types of geode to choose from that you can crack open using one of our custom-made geode cracking machines. Plus, we pack our little shop full of all kinds of minerals, fossils, and more to purchase

Clark's Elioak Petting Farm

You can visit the Clark's Elioak Farms website where you can find even more information about the farm including entry fees, birthday parties, tours, and so much more. Its a great farm, we love it, and I think you will too! (Please note, our operations at the farm remain suspended at this time.)

our warehouse

Our warehouse is located in Ijamsville, MD. This is where we store well over 120,000 lbs of real rocks, minerals, and fossils from around the world. Plus, we also prepare for and store our educational program display cases, and soon will be shipping from this location (and our store) to fulfill online orders. The picture is nice, but it rarely looks this clean or neat...