Just Grinding And Pecking Away: A Closer Look At Ground Stone Tool Technology (Part One)

A grooved stone maul. A prehistoric object, found on many continents, made by grinding or pecking the groove to attach a handle. An incredibly labor-intensive activity taking many hours to complete.

In Alberta, stone mauls were used for thousands of years. One maul was found in an archaeological site dating over 10,000 years in Alberta (Fedyniak and Giering, 2016). Unfortunately very few mauls are found in an archaeological context, allowing accurate dating. There is currently no known change in their shape and/or size through time. And, these mauls mainly occur on the southern prairies and not further north.

In the mid-1970s, while out hunting in southern Saskatchewan, I picked up this grooved stone maul in a cultivated field near the edge of a slough. The maul is made from a coarse granitic stone. This one is about 11cm high and 10cm wide. It weighs 1.3kg (2.8lbs). The groove goes almost all the way around the maul, but gets shallower on one side. The groove is about 15mm wide and 5mm deep. One side of the maul has been damaged, either through use or when hit by a farm implement.

Considerable chunk missing on one side of the maul. There is a thin, deep cut line at one edge of the fracture. Possibly made by a cultivator blade rolling over the maul, breaking off a piece.
Close-up view showing the grove in the maul that is polished and smoothed and not as rough as the rest of the stone.

At the time my buddies gathered around to see what I’d found. I confidently stated it was a grooved maul. First Nations people made and used them for pounding things.

How could anyone know so much about a seemingly foreign-looking object by just picking it up and looking at it? Good question. There’s nothing really obvious about the maul to give us a clue what it was used for. Is there? Most people would have walked right by it without even noticing it was a tool.

One method to discover the function of an object is to closely examine it. I looked at both the distal and proximal polls. The proximal poll (smaller end) contained small surface indentations and pocking from use. The distal poll showed smoothed areas, possibly from grinding. It was also slightly flattened from use. Likely from pounding or grinding things. More sophisticated methods, such as microscopic use-wear analysis, would reveal even more about how these abrasions were made.

The base of the proximal poll of the grooved maul, showing indentations and pocking from pounding.
The base of the distal poll showing a combination of indentations but also smoothing on some grains, possibly from grinding something.

Another method we use to determine the function of an object are historic references and ethnographic sources. If an object was used in a certain manner historically, then it was also possibly used in the same way thousands of years ago. This is known as ethnographic analogy. It can be dangerous and it’s always best to use multiple lines of evidence before determining the function of an object.

In his journals explorer David Thompson mentioned First Nations women used stone hammers to smash up deadwood from the trees. According to early ethnographers, “The hammers were of two sorts: one quite heavy, almost like a sledge-hammer or maul, and with a short handle: the other much lighter, and with a longer, more limber handle. This last was used by men in war as a mace or war club, while the heavier hammer was used by women as an axe to break up fallen trees for firewood; as a hammer to drive tent-pins into the ground, to kill disabled animals, or to break up heavy bones for the marrow they contained.” (Grinnell, G. B. 1892. Blackfoot Lodge Tails; The Story of a Prairie People. Scribner, New York.)

This rare photograph of a Northwest Coast Kwakiutl warrior shows a rather larger, fearsome looking stone hand maul near his right arm. Northwest Coast First Nations peoples made a very sophisticated array of ground stone tools. The shapes and varieties of these mauls are considerably different than those used by people on the Canadian prairies. (From Hilary Stewart, 1973. Artifacts of the Northwest Coast Indians. Hancock House Publishers.)

There are other ways to determine the function of an object, which I discuss in later posts. However, first we have to talk about how these mauls were made. Based on ethnographic sources and examination of the stone hammer, the groove was made by patiently pecking, or grinding away at the stone with another preferably harder stone.

The question I often ask myself is why would anyone go through all the trouble to make a stone grooved maul to pound berries, meat and other things, when you can just pick up a suitable rock and use it to pound something, then discard it when you’re finished? You wouldn’t want to carry this object too far. My colleague, Robert Dawe, Royal Alberta Museum tells me that people used the mauls at campsites and left them there when they move. The mobile Kalahari bushmen did the same thing with their heavy metal axes.

There are a few possible reasons for carrying a maul with a hafted handle permanently: 1) warfare and defense; 2) it had sacred or symbolic meaning and was used in ceremonies; and, 3) it created more leverage and force. The American ethnographer George Bird Grinnell described an old Blackfoot man’s attempts to heal a sick child. He instructed two women to sit near the doorway of the tipi facing each other. “Each one held a puk-sah-tchis, [a maul] with which she was to beat in time to the singing” (Grinnell 1892:163) (In (Fedyniak and Giering, 2016).

A hafted grooved stone maul from rawhide and wood. A handle on this stone maul would create more leverage and force. The author of this post said it took about eight hours of pecking and grinding to form the groove on this fine-grained granite rock. From, ‘Sensible Survival’: https://sensiblesurvival.org/2012/04/28/make-a-hafted-stone-axe/

As I mentioned before, making ground stone tools is very labor-intensive. But, I have read few articles on just how much work it takes to make a stone maul. One researcher conducted an experiment to make a mortar from a basalt cobble. Below are some basic results of that research.

In this particular experiment, it took about two hours to peck a cavity about 8cm in diameter, 3cm deep into a basalt cobble. From, Andrea Squitieri and David Eitam, 2016. “An experimental approach to ground stone tool manufacture. Journal of Lithic Studies Vol. 3:553-564.
Pecking the mortar hole from a basalt cobble. From, Andrea Squitieri and David Eitam, 2016. “An experimental approach to ground stone tool manufacture. Journal of Lithic Studies Vol. 3:553-564.
Finishing the mortar by polishing it with water and basalt powder. Andrea Squitieri and David Eitam, 2016. “An experimental approach to ground stone tool manufacture. Journal of Lithic Studies Vol. 3:553-564.

I guess there’s only one way to find out how long it takes to make a grooved stone maul out of quartzite. And that is to make my own grooved stone maul. I’ve nothing but time on my hands during these Covid days. I mean, how hard can this be?

The Experiment

First I went down to my local river to find some suitable rock candidates to make a stone maul. What was I looking for? Having never made one, I wasn’t sure. I checked some of the mauls at the Royal Alberta Museum collections. They come in all shapes and sizes. And they are made from various types of rocks: granite, basalt, sandstone and quartzite. But, according to research at the Royal Alberta Museum, in Alberta, First Nations people used quartzite (67%) most often to make a stone maul (Fedyniak and Giering, 2016). The reasons? Quartzite was the hardest and most abundant rock available.

A sample of stone grooved mauls in the Royal Alberta Museum collections. This photograph is taken from an article by Kristine Fedyniak and Karen L. Giering, 2016. “More than meat: Residue analysis results of mauls in Alberta.” In: Back on the horse: Recent developments in archaeological and palaeontological research in Alberta. ARCHAEOLOGICAL SURVEY OF ALBERTA, OCCASIONAL PAPER No. 36.
Looking for suitable rocks to make a stone grooved maul along the south bank of the North Saskatchewan River, Edmonton, Alberta, Canada. These rocks along the shore have eroded out of a higher layer of Saskatchewan Sands and Gravels. Although these deposits contain a variety of types of rocks of different sizes, by far the most common is quartzite, a hard metamorphic rock. I looked at thousands of rocks before picking one or two particular specimens.

After searching for some time, the cobble I finally decided on felt the right weight to pound things and was almost round and symmetrically shaped. This cobble was about 12cm high and 11cm wide. Before pecking, it weighed 1.38kg (3.0lbs).

The unmodified quartzite cobble I chose to make my grooved stone maul.

I’ve read some literature about stone tool pecking and grinding. According to most sources the hammer used to peck out the groove should be a harder material than the stone maul material. This is somewhat problematic since quartzite is a 7 on the Mohs hardness scale. Even granite is slightly softer being only around 6.5-6.6 on the Mohs hardness scale. And basalt is only a 6. This then posed the first problem. If prehistoric peoples were pecking and fashioning grooved stone mauls out of quartzite, then what were they using to make them? None of the local rocks in the Edmonton area were harder than quartzite.

And were they just pecking, or incising and grinding the grooves? The smooth finish on the stone maul I found didn’t help answer that question. When I used a magnifying glass I could see the granite granules were crushed and smoothed. Examination of the groove under a low-power microscope might tell me even more.

I chose these two rocks to peck and groove the maul. The one on the left is a granite (1.6lbs or 0.73kgs) and the one on the right is probably a quartzite (0.44lbs or 0.2kgs) (hard to tell with the cortex still on the rock). Only experimentation and time will tell whether these two rocks will work. I’m not that optimistic though.

I have no idea how long this will take. It may take weeks, or perhaps months. I’ll record the amount of time I spend pecking away, whether I peck or grind and how my pecking stones hold up. I’ll keep you posted on my progress, problems, success. We’ll turn this post into experimental archaeology, since there are still relatively few studies on how to make ground stone tools. Especially grooved mauls found on the Canadian prairies.

That’s it for now. Time to get to work….

The Viking Ribstones, near Viking, Alberta, Canada. In a former post (https://canehdianstories.com/wp-admin/post.php?post=1776&action=edit) I mentioned these sacred rocks have lines and holes pecked or incised into the stone. The lines depict the ribs of the buffalo. The holes possibly to kill the buffalo. An example of ground stone technology on a massive scale. I marvel at the amount of work that went into making these objects.