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                                                        Burkholder Quarry

                                     (Martin Limestone)

                                 Ephrata, PA

 

                      

October 31, 2009 (Saturday): Kurtz Quarry, Denver, PA & Burkholder Quarry, Ephrata, PA.  Members of DMS will collect at two active quarries in southeastern PA.  Kurtz Quarry cuts through dense gray to black dolomitic limestone.  Mineralization occurs as vein fillings in brecciated limestone.  Minerals that have been found at this quarry include: pink and white dolomite, small calcite crystals, dark purple fluorite cubes, minute sphalerite crystals, yellow barite on pink dolomite, quartz crystals, chalcopyrite, pyrite, and malachite.  Burkholder is also an active quarry located at 404 Martindale Road.  Burkholder has produced some nice calcite and fluorite crystals in the past.  Note: This is about a 1.5-hour drive from WilmingtonChildren must be at least 13 years old and supervised by an adult at all times in order to collect here.  We will meet at Kurtz Quarry at 8:00 AM.  Please sign up by October 27th if you would like to attend!

 

November 15, 2008, Saturday: Kurtz Quarry, Denver, PA & Burkholder Quarry, Ephrata, PA .  (CANCELED DUE TO WEATHER.  May be rescheduled for November 22nd.  If you've already signed up, Bob Asreen will call you.  If you have yet to sign up, contact Bob first.  We will post here, if we are rescheduling for sure.) 

 

On Saturday, members of DMS will collect at two active quarries in southeastern PA.

Kurtz Quarry cuts through dense gray to black dolomitic limestone.  Mineralization occurs as vein fillings in brecciated limestone.  Minerals that have been found at this quarry include: pink and white dolomite, small calcite crystals, dark purple fluorite cubes, minute sphalerite crystals, yellow barite on pink dolomite, quartz crystals, chalcopyrite, pyrite, and malachite. 

Burkholder is an active quarry located at 404 Martindale Road.  Burkholder has produced some nice calcite and fluorite crystals.  

Please signup if you would like to attend!  Note: This is about a 1.5-hour drive from Wilmington.



November 10, 2007, Saturday: Martin Limestone Kurtz Quarry, Denver, PA and Burkholder Quarry, Hinkletown, PA: 
These quarries cut through dense gray to black dolomitic limestone.  Mineralization occurs as vein fillings in brecciated limestone.  Minerals that have been found at these quarries include: pink and white dolomite, small calcite crystals, dark purple fluorite cubes, minute sphalerite crystals, yellow barite on pink dolomite, quartz crystals, chalcopyrite, pyrite and malachite.  Please sign up by Nov 8th if you would like to attend!


Burkholder Quarry Slideshow (11-10-2007)


May 5, 2007, Saturday:
Martin Limestone Kurtz Quarry, Denver, Lancaster County, PA and Burkholder Quarry, Ephrata, Lancaster Co., PA.  Kurtz Quarry cuts through dense gray to black dolomitic limestone.  Mineralization occurs as vein fillings in brecciated limestone.  Minerals that have been found at this quarry include: pink and white dolomite, small calcite crystals, dark purple fluorite cubes, minute sphalerite crystals, yellow barite on pink dolomite, quartz crystals, chalcopyrite, pyrite, and malachite. 

Burkholder is an active quarry located at 404 Martindale Road.  Burkholder has produced some nice calcite and fluorite crystals.   Fieldtrip is from 8:30AM - 5:00PM.

Please signup if you would like to attend!  Note: This is about a 1.5-hour drive from Wilmington.

 

May 14, 2005, Saturday: Martin Limestone Burkholder Quarry, Ephrata, Lancaster Co., PA:  Burkholder is an active quarry located at 404 Martindale Road.  Burkholder has produced some nice calcite and fluorite crystals.   Please be the Martin Limestone office by 9:00 AM sharp!  All attending must sign a release form.  Junior members are welcome but must be supervised by a parent.   

 

Burkholder Quarry, 12-2-2006

 

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Igneous Dike

 

Bob stowing his finds
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Karissa's Calcite vug--she had to leave it Karissa, Bob, and Joe on the Quarry floor


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Above: Yellow calcite and purple fluorite crystals abound in the karst of Burkholder Quarry.  Scott removes a specimen of purple fluorite. (bottom right)

 
Geology

The Burkholder quarry is located at the northern boundary of the Lancaster Valley Section of the Piedmont Physiographic Province. The Lancaster Valley consists of Cambrian- and Ordovician-aged limestone and dolomites of varying thickness that have been faulted and folded. Immediately bounding the quarry to the north are Triassic-aged red beds, composed of conglomerates, sandstones and shales, some of which are exposed along Denver Road.

The two rock units that are exposed in the quarry are the Lower to Middle Ordovician aged (485 million year old) Epler Formation and the Middle Cambrian (520 million year old) Buffalo Springs Formation.

 

Geologic Time Scale

The Epler Formation consists of dark gray to black, very finely crystalline, interbedded limestone and dolomite, which is exposed in the northern 4/5 of the quarry. The Buffalo Springs Formation, which is exposed only in the previously mined cove along the southern highwall, is a light to dark gray, fine to medium crystalline, laminated and interbedded limestone and dolomite.

The rocks at Burkholder Quarry were intensely deformed from faulting and folding. A high thrust fault (dipping approximately 70 degrees south), with a displacement of a few thousand, separates the Buffalo Springs Formation in the southern part of the quarry from the Epler Formation in the north. The rocks in the Epler Formation are not as intensely deformed as those in the Buffalo Springs Formation. However, the Epler Formation is steeply dipping at the fault, is cut by several faults with resultant fold development and dips approximately 15 to 20 degrees at the northern highwall.


Mineralogy



Mineralization occurs in veins and in vug fillings in brecciated rock and includes:

Barite, which is rarely found as yellowish plates (5mm);

Calcite, which commonly occurs as massive white veins and scalenohedral crystals and smaller colorless crystals;

Chalcopyrite, which occasionally occurs as golden crystals on and in the calcite;

Dolomite, which occurs as well formed, pink curved crystals usually associated with calcite and fluorite;

Fluorite, which occurs as 3-4mm purple cubes or seen as purple sheen on fractures and joints;

Malachite, which appears as a green halo around chalcopyrite;

Pyrite, which is common as tiny pyritohedron forms associated with calcite and fluorite and as inch cubes in the green mudstone/limestone layer;

Quartz, which occurs as opaque masses in calcite and occasionally as terminated clear crystals; and

Sphalerite, which is uncommon but sometimes occurs as red-orange masses associated with calcite and dolomite. [Bob Asreen]

 

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This page last updated:  January 17, 2013 09:16:38 PM


Next Meeting
 

January Program, Monday, January 13, 2014:

"DVD Presentation, Election"

General Club Meeting:
January 13, 2014
(Monday)

We are meeting at
The Historic Greenbank Mill,  Wilmington, DE


Special Meetings:
 

*Show Committee Meeting, January 9, 2014

*New Home/Lapidary Committee, 2014

*Board Meeting, to be determined

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