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Petroglyphs 2019-04 April 2019 West Seattle Petroglyphs Page 1 Volume 54, Number 4 Monthly Bulletin of the West Seattle Rock Club, Inc. Seattle, Washington Website: http://www.westseattlerockclub.org Our Club: Practices the Rockhound Code of Ethics Meetings: Visitors are always welcome! WEST SEATTLE PETROGLYPHS Mike Wall, Editor P.O. Box 16145 Seattle, WA 98116 email: [email protected] April 2019 Happy Easter April 2019 West Seattle Petroglyphs Page 2 WEST SEATTLE ROCK CLUB, INC. Mailing Address: P.O. BOX 16145, Seattle, WA 98116 The purpose of this Club is to promote the study and enjoyment of the Lapidary Arts with good Rock- hounding and good fellowship; and to further education and lapidary skills for all; to conduct field trips for exploration and collection of minerals, gems, rocks and fossils; to promote shows and displays; to publish a monthly periodical known as West Seattle PETROGLY PHS relating to club activities. **************************************************************************************** OFFICERS AND BOARD OF DIRECTORS (2019): President Brooke Babcock (360) 305-8106 Vice President Annette Nelson (206) 379-3677 Secretary Sue Fox (206) 835-0774 Treasurer Audrey Vogelpohl (206) 932-3292 Federation Director Audrey Vogelpohl (206) 932-3292 Director at Large Ken Schmidt (206) 932-3626 Mineral Council Reps (Open) Newsletter - Editor Mike Wall (206) 476-6471 Current Past President Scott Ryan (206) 354-2101 **************************************************************************************** COMMITTEE CHAIRPERSONS (2019): Show Co-Chairs Sue Fox (206) 835-0774 Annette Nelson (206) 379-3677 Programs <Vice President> <Vice President> Refreshments/Hospitality Sue Fox (206) 835-0774 Membership Mary Bentler (206) 932-6108 Historian Audrey Vogelpohl (206) 932-3292 Library Chair Erin Thompson (253) 307-1589 Field Trips <Open> <Open> Webmaster Donn Ullery (206) 550-1318 **************************************************************************************** AFFILIATED WITH: Northwest Federation & American Federation of Mineralogical Societies Seattle Regional Gem and Mineral Show Committee Washington State Mineral Council ALAA – American Lands Access Association **************************************************************************************** Meetings are held on the Fourth Wednesday of each month, except for November which can be on the THIRD or FOURTH Wednesday depending on Thanksgiving and no meetings in July and December The meetings are held in Adams Hall of the Tibbetts United Methodist Church 3940 41st S.W. (corner of 41st S.W. and S.W. Andover Street) Seattle, WA 6:15 PM – Junior Meeting 7:00 PM – Adult Meeting Dues are: $20.00 first year (including name badge), then: $10.00 per adult member per year or $15.00 for 2 adults in same family, $3.00 per junior member per year VISITORS ARE INVITED AND ARE ALWAYS WELCOME TO ALL MEETINGS All material in this Bulletin may be reprinted if properly credited - Exchange Bulletins are most welcome. April 2019 West Seattle Petroglyphs Page 3 CLUB CALENDAR We'll be having a bbq on Friday night for the vendors and club members. There will be a sign up sheet for sides to bring. The club will April 24, 2019 supply the hotdogs, hamburgers and buns and Junior Meeting — (6:15 pm) Rich will bbq. See everyone soon. Program: Leadership Badge and Junior Brooke Babcock Liaison Discussion WSRC President General Meeting (6:45 pm) 6:45 - Meet, Greet, Snacks & Drinks NEW MEETING 7:00 - Business Meeting Start Time START TIME Program: Filling grab bags & Video supplied by the Vogelpohls Shown-n-Tell: What did you get at our 6:45 PM last show (or any previous show) (Don’t be late) April 26, 2019 Setup — all day starting around 10:00 Dinner — ~6:00 pm WHAT’S INSIDE April 27/28 2019 - The Big Show Rocks, Rocks & more Rocks — both days Take down — ~5:00 pm Club Calendar 3 President’s Message 3 PRESIDENT’S New Meeting Start Time 3 MESSAGE What’s Inside 3 WSRC Mar. General Meeting Minutes 4 Hello everyone, Welcome to rainy April, but it’s our Show 2019 Refreshments 5 Month! I can't wait for the show, there will be lots to see and we would love for every- 2019 Dues are Past Due 5 one to come and participate. We are in need of volunteers so please sign up for a Annual Donation 5 shift. It's a lot of fun and we get to talk about our hobby with the community. Asteroid Impact Craters—Part 2 6 We'll be filling rock bags at this month's Apocalyptic Asteroid Impact meeting to sell at the junior’s station. If Craters — Part 3 7 you are crafty and want to make some bags to fill with rocks, feel free and bring them 2019 Field Trips 10 to the next meeting. They only need to be about 6x6 inch squares that close/tie on the 2019 Shows 10 top. April 2019 West Seattle Petroglyphs Page 4 WEST SEATTLE ROCK CLUB – GENERAL MEETING MINUTES March 27, 2019 Business: The meeting was called to order by President Brooke Babcock. 20 adult members, 6 junior members and 7 guests present. Members Rich Babcock, Robert Cooper, Zoe Ryan, and Maggie Babcock won the door prizes. No new members to welcome, however some of the guests have picked up applications. No changes reported to the February meeting minutes. Committees: Junior Advisor Coordinator (Annette Nelson): Brooke Babcock led the junior meeting, topic was “Brainstorming show cases and junior activities” Seattle Regional (Lyle Vogelpohl): Show case trailer has up-to-date licenses and insurance. Some power strips are missing from the trailer, we may need to buy some. Northwest Federation (Audrey Vogelpohl): Mid-year meeting is June 1 in Coeur D’Alene, ID. Annual meeting is in October in Lewiston, ID. Check out the March/April newsletter for information on the Junior achievement essay application Editor's report (Mike Wall): Newsletter content deadline is the 2nd Wednesday of each month. Washington Mineral Council (Kat Koch): no update, not in attendance Librarian (Erin Thompson): the library case wasn’t available this month; check it out next month. Refreshments for the meetings (Sue Fox): April snacks = Erin Thompson and drinks = Jess and Don MacDonald and Matt Roberts. May snacks and drinks = Mike Wall. Historian (Audrey Vogelpohl): adding photos to the tri-fold panel, in preparation for the show Field Trips and Shows: see Petroglyphs (last page) Old Business: 2019 Show, April 27-28: (co-chairs, Annette Nelson and Sue Fox) set-up day and POTLUCK dinner is Friday, April 26th; Rich and Brooke Babcock have volunteered to coordinate. Volunteer sign-up sheets were routed – we need LOTS of help! Video Booth: received confirmation that Ron Nims will do the video booth this year (and 1 case) Flyers and Posters are available – help us advertise Door prizes: Does anyone have items to donate? Idea: offer one year’s membership (either individu- al or family) as a door prize. Show Banner: Rich Babcock will get new dates printed Club T-Shirts: Decision was made not to order new t-shirts since we had so many of the old ones left Donating $ to non-profit organization Audrey Vogelpohl moved that we donate $100 to a non-profit organization; Seconded by Bo Jeffers. No discussion, motion carried. Outgoing president Scott Ryan will select a recipient. (Continued on page 5) April 2019 West Seattle Petroglyphs Page 5 (Continued from page 4) New Business: Next Board Meeting: FIRST WEDNESDAY OF THE MONTH, next one = April 3rd, 7pm, at the Bab- cock’s house. Diane Christensen provided contact information for an “amethyst guy” in Tacoma that we can buy direct from if we arrange to go with the Shelton club Program: How to set up a display case (presenter = Rich Babcock). Show and Tell — “Show-Worthy Rocks”) Lyle Vogelpohl - a thunderegg from Oregon (which will be the displayer’s prize) Brooke Babcock – calcite with quartz, stalactite Ezra Babcock – double terminated quartz, fossil, 2 geodes Zoe Ryan – a piece of a geode Guest Devin O’Reilly – pyrite with quartz from the east Duwamish greenbelt Maggie Babcock – petrified wood from Saddle Mt. Erin Thompson – mystery rock from a garage sale (chrysocolla? Amazonite?) Robert Cooper – jasper with druzy Dave Clausen – turquoise, crystal, carnelian agate, fossil shell, ruby (Dave won the displayer prize) Ken Schmidt – tumbled rock Scott Ryan – told a story about how being a rockhound and having rocks in your pocket to share can help you “land” a new house! Raffle The meeting was adjourned; Respectfully Submitted by Sue Fox, WSRC Secretary 2019 2019 DUES REFRESHMENTS ARE PAST DUE Note: The signup sheet is available at our meetings. If you have not paid your 2019 dues yet, please see Please signup. There are still spots available for the Audrey at the next meeting to bring your membership remainder of the year. Thanks to everyone for bring- up to date. The dues amount are listed on page 2. ing refreshments! This Month — April ANNUAL DONATION Snacks: Erin Thompson (30-40) Regarding the club's annual donation to a rotating charity of the outgoing president's choice, this year, Drinks: Jess & Don MacDonald (30-40) let's go with the Washington State Mineral Coun- cil. The advocacy work by the likes of Ed Lehman to ——————————————————- keep wilderness areas open for rockhounding benefit Follow-on month reminder: every Washingtonian, possibly for generations. May Scott Ryan 2018 Past President Snacks: Mike Wall (30-40) Drinks: Mike Wall (30-40) April 2019 West Seattle Petroglyphs Page 6 ASTEROID IMPACT CRATERS — PART 2 by Kat Koch, Cascade Mineralogical Society Large to Larger Impact Craters on Earth. Eastern Russia’s Lake El’gygytgyn Lake El’gygytgyn rests inside a 3.6-million-year-old meteorite impact crater, and preserves the longest continu- ous climate record in the Arctic. It’s about 15 kilometers (9 miles) across, the crater is surrounded by an uplifted ridge some 18 kilometers (11 miles) across. Outside the crater, the land slopes gently, but inside the crater, walls descend steeply to a fairly flat-bottomed bowl, now filled by Lake El’gygytgyn.
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  • Cross-References ASTEROID IMPACT Definition and Introduction History of Impact Cratering Studies
    18 ASTEROID IMPACT Tedesco, E. F., Noah, P. V., Noah, M., and Price, S. D., 2002. The identification and confirmation of impact structures on supplemental IRAS minor planet survey. The Astronomical Earth were developed: (a) crater morphology, (b) geo- 123 – Journal, , 1056 1085. physical anomalies, (c) evidence for shock metamor- Tholen, D. J., and Barucci, M. A., 1989. Asteroid taxonomy. In Binzel, R. P., Gehrels, T., and Matthews, M. S. (eds.), phism, and (d) the presence of meteorites or geochemical Asteroids II. Tucson: University of Arizona Press, pp. 298–315. evidence for traces of the meteoritic projectile – of which Yeomans, D., and Baalke, R., 2009. Near Earth Object Program. only (c) and (d) can provide confirming evidence. Remote Available from World Wide Web: http://neo.jpl.nasa.gov/ sensing, including morphological observations, as well programs. as geophysical studies, cannot provide confirming evi- dence – which requires the study of actual rock samples. Cross-references Impacts influenced the geological and biological evolu- tion of our own planet; the best known example is the link Albedo between the 200-km-diameter Chicxulub impact structure Asteroid Impact Asteroid Impact Mitigation in Mexico and the Cretaceous-Tertiary boundary. Under- Asteroid Impact Prediction standing impact structures, their formation processes, Torino Scale and their consequences should be of interest not only to Earth and planetary scientists, but also to society in general. ASTEROID IMPACT History of impact cratering studies In the geological sciences, it has only recently been recog- Christian Koeberl nized how important the process of impact cratering is on Natural History Museum, Vienna, Austria a planetary scale.
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