Showing posts with label Ground Stone. Show all posts
Showing posts with label Ground Stone. Show all posts

Wednesday, June 10, 2015

Ground Stone Tools

Ground Slate
 I just need one more day to finish up this order and get it shipped.  Unfortunately, I have two days of CPR/First Aid training starting tomorrow morning, so that one day of work probably won't get done until the weekend.  The order is already late, but I was really hoping that I could get it all together and shipped before the start of th First Aid course.  It sucks, but I tried.  I hate missing deadlines, but even worse is there are some cool pieces in the order and I'm not able to take the time to really enjoy them.  Here's a look at the finished Maritime Archaic ground slate lances and a few slate and spruce ulus that are almost ready to be lashed and glued together.

The red slate lances have been oiled.  The grey slate ulus are still dry, but they'll take a nice gloss too once I add a bit of oil to them.  I'd really like to get the lashing and glue on them tonight so that they can dry overnight.
Photo Credits: Tim Rast

Wednesday, November 6, 2013

Ground Stone Endblades

A pair of replacement ground stone endblades for a Thule harpoon that I made earlier this year.  The one on the left is made from slate and the one on the right is nephrite.  The slate one is sharp and quick to make, while the much more time consuming nephrite enblade is durable and long lasting.
Photo Credits: Tim Rast

Friday, June 8, 2012

Wrapping up at The Rooms

Parents volunteers are awesome
On Tuesday morning, I had my last Open Minds classroom visit of the year at The Rooms and I'm looking forward to next year.  The ground stone or ulu making sessions have been really popular with the kids.  I like doing the flintknapping demonstrations, but there are some real memorable learning opportunities  when the kids get to work with their hands and create something that they can keep.  Its much safer and easier to do that with ground slate instead of knapping stone or glass. We sure get dusty though!

Discussing what they learned.
Photo Credits: Tim Rast



Monday, May 7, 2012

Counting Down

Ground stone reproductions for Alaska
I have three orders to wrap up in the workshop in the next month.  Right now, I'm a little under 6 weeks away from heading into the field again for the summer, so that prep work is on my mind as well.  Last Thursday and Friday I took a Wilderness First Aid Course with a couple other archaeologists and northern scientists.  It was a nice break from the workshop.  It had been a few years since I last took a First Aid/CPR class and its good to get the reminders and confidence boost again.


Ulu and slate point reproductions
In the workshop, I'm still focusing on the Cape Krusenstern reroductions.  These reproductions are an ulu broken through a drilled hole and the tip of a slate lance or knife.  As with the other pieces in this set, I'm working from photographs and making two copies of all the artifacts.  The position of the hole in the ulu makes it tempting to imagine that the missing piece would mirror the recovered section and the original ulu had a single hole in the middle.  However, I think its just as likely that this is one end of a longer ulu and that there may have been two or more holes drilled along the edge.  I'm satisfied with the form of the ulu, but I'm working at antiquing the surface a bit more.    In the photos here, they are kind of clean and I want to dirty them up and soften some of the mottled colouring in the stone.

One central hole?

Or maybe we're just seeing one of a series of holes along the upper edge of a longer blade.
Photo Credits: Tim Rast

Monday, April 23, 2012

Maritime Archaic Flute and Adze

Hafted and unhafted adzes, flute, etc.
I'm packing up and shipping the Maritime Archaic Indian, Groswater Palaeoeskimo, and Recent Indian reproductions bound for Red Bay and Newfoundland's west coast later today.  We had nice sunny weather yesterday so I photographed the finished pieces in the backyard.  In this post, I'll talk a bit about the bird bone flute and the adzes in the set.

Goose humerus flute
For the flute, I used a goose humerus, because it was the biggest bird bone that I had on hand.  The Maritime Archaic Indians made a variety of flutes and whistles from the hollow bones of large birds including geese, gannets, swans, and eagles.  Ulnas seem to have been prefered, but other bones show up as well.  Most of the flutes and whistles that I'm aware of were found in the burials at Port au Choix.  I'm no musician, but I've talked to some people who are passionate about flutes and whistles - so hopefully they'll correct me if I get something wrong here.

blow across the top
This reproduction is a flute, meaning you blow across the opening to produce a sound.  A whistle is an instrument that you blow into the end to make noise.  The Maritime Archaic Indians made both.  In the case of a whistle, a slanted notch or hole is made somewhere midway down the shaft of the bone.  For a flute, you need to cut a small slanted notch in the end that you blow across.  You play it by blowing across the top, similar to how you make a noise blowing across a bottle mouth.  That little notch is important - it splits the air and creates the sound of the flute.  I wasn't aware of the mechanics of flutes the first time I made a Maritime Archaic bird bone flute and I though that little half hole was a crack in the bone where it broke through a finger hole.  That's not correct - it was intentionally made.  If you look carefully at the intact flutes from the province, you'll see a little notch on the end of every one.  If its missing that notch, look at the holes along the body of the instrument - one will probably have a slant edge to it, indicating that it was a whistle.

The end notch is important
I'm not a musician.  At all.  I was in a marching band in elementary school and they kicked me off the bugle and put me on baritone bugle because it had fewer parts in most songs and my errors were less shrill.  Then they took me off the baritone bugle and made me a flag bearer.  Still, if I blow on this flute and get the angles right I can get it to make a sound, especially if I keep my finger over the top hole and keep the bottom hole open.  The impression that I get is that smaller bones makes a more shrill noise, whereas those big wing bones from the bigger birds would create a lower, more pleasant sound.  I know that the baritone bugle was bigger than the regular bugle and it made a lower noise, so I'm guessing the same principle is at work here.

Adzes were woodworking tools
For the adze, I used a silicified slate or argillite for the bit, hardwood for the handle, sealskin for the lashing and ochre and oil, water, and egg for the pigment.  The complete adze will be there for the kids to pass around and handle, while the unhafted blade will be used in the mock dig.  For these sorts of stone tools, I like to leave traces of all the stages of manufacture in place.  Some axes, adzes, or gouges that we find in the province are perfectly finished and polished, but most have a nicely finished (and perhaps use damaged) bit end, but the rest of the body of the adze is more roughly shaped and usually show traces of chipping and pecking.  We don't find the wood handle or lashing, so that's a bit of guesswork based on other adzes from around the world.

The working bit on an Maritime Archaic Adze is usually the most heavily worked and finely finished part of the tool.  The rest of the stone would have been buried under lashings and wasn't as finely finished or polished.


Bit sits on a shelf, but doesn't butt against the back
The proximal ends of adzes are often irregular and I've sometimes wondered why they aren't more carefully finished.  It seems like they could be carefully shaped to butt up against the handle and create a more secure bond.  Robin Wood has been part of a team building a reconstruction of a Bronze Age boat and he made many of the woodworking tools used in the effort.  He noted in his bronze adzes that if the back of the bit made contact with the wood handle it would bounce loose during use. In Newfoundland, the Palaeoeskimos used antler sockets for their stone adzes to act as shock absorbers to prevent this problem, but I think that the Maritime Archaic probably just made sure that the back of their adze blades didn't make contact with the wood handle.  I've started leaving a gap between the distal end of adze blades and the wood handle in my Maritime Archaic reproductions now.

I have a lot of sealskin thong on hand, so I use it on reproductions like this.  Different sorts of leather or rawhide lacing could have been used as well as cordage made from plants or roots.  We don't get wood or leather preservation in Maritime Archaic sites in Newfoundland and Labrador, so we details of the handle and lashing are based on analogies with other adze using cultures.

A forked branch is used to make the handle.  I try not to get stuck in a rut when I make reproductions like this.  Since I 'm speculating on the style of handle, I like to change things up - maybe someday I'll accidentally make one that is correct.  For this particular adze, I left a longer knob opposite the bit end and covered the whole thing in red ochre.  I'm happy with it.  I think if I sent it back in a time machine and someone in a Maritime Archaic camp tripped over it they'd wonder who left that there and not "what the heck is that thing?"
Photo Credits: Tim Rast

Wednesday, March 14, 2012

Stone, Culture, and Science in the Classroom

Two of the student's reproductions
During this time of year I do a lot of work with school kids, primarily through the Open Minds program at The Rooms art gallery, museum, and archive here in St. John's.  Sometimes these are talks about archaeology and the pre-contact cultures of Newfoundland and Labrador structured around a flintknapping demonstration.  Lately, I've been doing ground stone tool making with grade 5 students.  We've been making ground slate ulus and men's knives based on Inuit artifacts from Labrador.



One for each student
In one of these workshops, I bring in prepared slate blanks, wood handles and all the grinding, drilling, and tying tools that the kids will need to complete the project.  With a class of around 25 kids and a half dozen adult helpers, we can help each student create their own slate ulu or men's knife in about 2 hours.  Its a satisfying project for everyone involved and the kids learn about Inuit people, archaeology, patience, and perseverance as they work to create their own stone tool artifact reproduction.

Parents and teachers help with the drill
An important part of the process is using traditional tools, like the bow drill, to create their reproductions.  This works especially well in the Open Minds setting at The Rooms because the classroom is set up next door to the Connections Gallery where many of the original artifacts are displayed.  During lunch or recess, the students have the opportunity to visit the Connections Gallery and see first hand the tools that they are using and recreating in the classroom.

A finished ulu - great work!
Yesterday, during the review at the end of the session, the instructor asked the grade fives what words they would use to describe Inuit people after their experience with making and using the traditional tools and the kids replied with; "Hard-working, Strong, Independent, and Patient".

"Hard-working, Strong, Independent, and Patient" 

Photo Credits: Tim Rast

Monday, January 30, 2012

Ground Slate Knives

Ground Slate Thule Men's Knife
This is a ground slate late Thule men's knife that I made in 2004.  One of the artifacts that we found this summer made me think of it.  Remember that roughed out ulu preform that I mentioned on the blog a couple weeks ago?   We found a broken and discarded knife at the site next to it, a few hundred metres away. It was made from the same slate, but this one had been completed before it was broken.  You can see how finely this slate takes an edge when it has been ground and polished sharp.   There was no sign of a handle, but you can imagine it hafted something like the reproduction in the photos.

Ground slate knife blade and two chert flakes found nearby.  Its more of an Inuit style knife, but the chert flakes were most likely Palaeoeskimo in origin.  Check out how nice the bevel is on the edge (inset).

Here's the tip of the knife in situ.  I think Lori found this piece.

It might have been hafted something like this.  I used wood for the handle and baleen for the haft.  There is a notch at the end of the handle, with a sealskin thong tied to it.  I can't recall the exact provenience of the original artifact that this is based on, but I believe it was the Western Arctic.
Photo Credits: Tim Rast

Wednesday, December 14, 2011

Pech Merle Museum Lithics

Upper Palaeolithic Blade Tools
The museum at Pech Merle had several display cases dedicated to the prehistory of France, from the Lower Palaeolithic through to the Bronze Age.  There were a lot of bone, antler, ivory, metal and ceramic artifacts on display, but of course, I was drawn to the stone tools.  Here are a few photos of some of my favourite pieces from the Musée Amédée Lemozi at Pech Merle. 


Chopping Tool, Burin, and Retouched Blade
Most of the artifacts in the exhibits were found at other sites.  There weren't many stone tools found in the actual cave at Pech Merle.  In fact, the three pieces in the photo on the left are the only lithics to have been found there.  The card with the chopper, burin and retouched blade explains that, with the exception of the paintings, the only evidence of prehistoric people in the cave are some footprints, some charcoal and these three stone tools.  Which is interesting in itself - although people were visiting and painting the walls and ceilings of caves like Pech Merle, they weren't living in them.

The Lower Palaeolithic had stone industries based on working cores into heavy, chopping bifaces.
Later, techniques focused on the flakes removed from the core.  I like this illustration of the Levallois technique.  Using the cut away drawing of the flake is a really effective way of explaining the process visually. 

In the Upper Palaeolithic the emphasis was on specialized flakes called blades, which were in turn pressure flaked into a variety of different tools.  The blade tools on this board belong to the Périgordien Tradition.

More blade tools in all shapes and sizes.  In these examples, most of the retouch is along the edge or end of the blades and you can still see the original dorsal surface of the blades.

These Solutrean tools have similar outlines to the blade tools in the previous photo, but look how they've been shaped and sharpened with precise, patterned pressure flaking covering the surface of the blades and bifaces.  A little more work and a little more control over the final form.
I don't really know anything about this board, but I'll take a guess.  I think its showing the chronological sequence between  the Sauveterrian and Tardenoisian and the older of the two is at the bottom, because they look a little coarser and there are pottery fragments in the top row.  Alternatively, these are prosthetic nose pieces and this shows the evolution of Klingon foreheads from the old Star Trek to the Next Generation.
Meticulous pressure flaking on blade based tools continued into the Neolithic and chalcolithic.  This big dagger was made on a blade, ground and polished and pressure flaked.  It still has the long curving arc of a blade.
This photo shows how these big blades would have been hafted.  I'm not sure what the wrapping material is, it looks like a root to me, but it could be leather.

In the middle on the right, you can see how the flint blade (silex in french) is glued against a wood handle with tar and then wrapped with a binding material to create a grip.
Meanwhile, spear points became arrowheads and took on a lot of different forms.
The caption for the above panel.  The points aren't in exactly the same place in the display and on the caption, so go by the outline, not their position on the board.  And they're in French and when I try to Google translate them they make no sense so... good luck!
Ground stone tools are one of the hallmarks of the Neolithic.  You can see that the blank was still chipped out of flint, but the final shape and working edge of this axe were done through grinding and polishing.

Another ground stone axe.
The appropriately named Chacolithic, or Copper Age, saw the introduction of copper into the tool kit.  I like this little panel - it makes me think of Elfshot.  Not my business Elfshot, but the actual little arrowheads that people used to find.  When I picture Elfshot in my mind's eye, these are the kinds of arrowheads that I imagine.
Photo Credits: Tim Rast
All photos were taken at the Musée Amédée Lemozi, Centre de Préhistoire du Pech Merle, Cabrerets France.



Monday, December 5, 2011

Labrador CURA Brings Slate Ulus to the Classroom

A nearly finished slate ulu
During the last week in November, the Labrador Community-University Research Alliance (CURA) members toured communities in southern Labrador.  They traveled from town to town and presented their latest research and initiatives to the communities that the project is partnered with.  
Grind stone in the classroom
One aspect of the trip was providing a heritage program to school kids.  I couldn't attend, but I supplied a ground stone tool making kit.   Kids could have a go at making their own slate ulus, using traditional tools and techniques.  It sounds like everyone had a good time.  Thanks to Amy, Andrew and Michelle for delivering the program!

Andrew helping set up a bow drill on a slate ulu blank
Michelle showing how the drilling is done

Using a nephrite bit to drill through a slate ulu blank

Amy helping tie the handle on to a drilled slate ulu

Slate blanks, handles and string

Photo Credits: Phillip Cairns, courtesy of Labrador CURA
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