NEXT MEETING: Wednesday, April 16, 2025, 6:00 PM at 2045 Memory Lane in Silver City, New Mexico. The GCAS's next monthly IN-PERSON ONLY meeting features speaker geoarchaeologist Dave Rachal PhD of Tierra Vieja Consulting in Las Cruces NM. Doors open at 6:00 PM with light refreshments on offer. Socializing and a brief-to-nonexistent business meeting will immediately precede Dave's presentation of: How Did The Seeds Get There? Ruppia cirrhosa Ecology, Depositional Context and Accurate Radiocarbon Dating at White Sands: "The stratigraphic and geomorphic contexts, and ultimately the chronometric determinations, at White Sands Locality-2 (WHSA-2) are topics of controversy that stem from conflicting interpretations of the processes that deposited the Ruppia cirrhosa (Ruppia) seeds within the paleo-Lake Otero footprint site....[O]ur interpretation depicts the shoreline as an unstable, dynamic lake margin to which Ruppia seeds...were transported from deep-water, offshore growth beds during storm events and deposited on the lake shore in seed balls. These unusual aggregates, known to mix seeds of wide-ranging ages, were gradually broken apart by several cycles of wave action and erosion and redeposited in layers....[W]e will delve into both the ecology and the depositional context of Ruppia and discuss why the Ruppia seeds at paleo-Lake Otero are problematic materials for radiocarbon dating." Check out Dave's and Tierra Vieja Consulting's YouTube videos (links are on our Events page) and bring your questions for him!

NEXT FIELD TRIP: Sunday, April 6, through Tuesday, April 8, 2025: Lyman Lake State Park/Springerville/Casa Malpais AZ. Sunday-Monday, explore Lyman Lake's petroglyphs & archaeological site on your own or with a group. On Tuesday 4/8, we have guided tour of Casa Malpais archaeological site. Reservations are required for ONLY the guided tour to the Casa Malpais site but we must give them a final tally no later than March 23, 2025, so please let trip co-leader Torie Grass ([email protected]) or Eduardo Argüello ([email protected]) know to put you on the list. More details available in newsletter and on Events page of this website, and in the blog posts below. As usual for any GCAS field trip, wear sturdy shoes and pack sun protection & water. See you there!

GCAS Trustees and Officers for 2021
To Repeat: Everything Helps the GCAS MAREC Project

New Studies in Archaeoacoustics

StonehengeRegular readers of this here site know that we generally prefer focusing our news on what's happening archaeologically in our own Southwest US/Northern Mexico region. However, we remain open-minded enough to occasionally publish news from further afield, especially when it contains implications for our own area. In this case, the article's headline is fully descriptive:

"A Remarkable New Study Suggests That Stonehenge Was Built to Amplify Sound During Ancient Ruling-Class Rituals - The stones also worked as a sound chamber, keeping outside noise out."

Acoustics engineers at the University of Salford in Manchester made a 1:12 scale model of Stonehenge to demonstrate its acoustic properties—which may have been integral to its use:

"The study found that people who spoke or played music inside the monument would have heard clear reverberations against the massive standing stones. Testing on the model also suggests that the stones increased the volume on interior sound, kept exterior sound out, and made it hard for anyone outside the structure to hear what was going on inside....There is also speculation that some of the smaller stones used in the ancient site’s construction may have been chosen for their musical qualities. Making a sound much like a metallic gong when struck, they could have been used as percussion instruments..."

IMG_1585We've previously blogged about lithophones (ancient stone percussion instruments) that have been found at sites throughout the greater US Southwest. Archaeologists have similarly studied rock alcoves, cliff faces, and other natural formations at sites like Chaco Canyon, New Mexico, and Horseshoe Canyon, Utah, for their acoustic properties. Extending the hypothesis, other natural rock formations like those found at City of Rocks State Park in New Mexico may also have acoustic properties that ancient inhabitants might have incorporated into performances and ceremonies. Perhaps further investigation may disclose a relationship between these acoustic properties and the location of an isolated prehistoric structure that the crew from Eastern New Mexico University excavated at City of Rocks in 2019.

/s/ webmaster [Photo of Stonehenge, via Getty Images. Photo of City of Rocks, via William Hudson.]

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