Author Archives: Callan Bentley

51st Annual GLMSMC Gem, Mineral and Fossil Show

Gem, Lapidary, and Mineral Society of Montgomery County MD., Inc.

51st Annual GLMSMC Gem, Mineral and Fossil Show

At the Montgomery County Fairgrounds – Maryland

March 21 & 22, 2015.

Montgomery County Fairgrounds –

16 Chestnut Street, Gaithersburg, Maryland 20877

Saturday 10:00 A.M. to 6:00 P.M.

Sunday 11:00 A.M. to 5:00 P.M

Admission is $6.00, ages 12 and older.
Admission is Free for Children (11 and under), Free for Scouts in Uniform.

To get a $1 off coupon please go to the club website: http://www.glmsmc.com/show.shtml

Plenty of Free parking for the show

More than 20 dealers will have gems, minerals, fossils, meteorites and crystals for sale. Enjoy demonstrations, over 40 exhibits, raffle, door prizes, free workshop, free specimens for kids, and/or get more information about specimens from your own collection. Those under 18 can dig for free specimens in the kid’s mini-mines!

Plans are to have set up again – the Youth Earth Science Education Area (great for Cub Scouts to work on their Belt loop and Webelos Academic pin!)

The Gem, Lapidary, and Mineral Society of Montgomery County, is a long standing non-profit organization that was formed to provide all persons interested in Earth Science (Geology, Mineralogy, & Paleontology) and Lapidary Arts the opportunity to increase their knowledge and broaden their interests through a variety of learning and collecting activities.

The club holds regular monthly meetings (2nd Monday of the month) (except July and August), sponsors presentations and organizes collecting field trips in additional to holding an annual show.

Mendenhall seminar @ USGS: Quakes on Wasatch Fault

Mendenhall Postdoctoral Research Seminar

Scott Bennett, USGS – Golden, CO

When: Wednesday, March 4, 2015 – 12 Noon

Where: Via WebEx and National Center, Room 1C400 (Visitor Center)

Details:

How Big and How Frequent Are Earthquakes on the Wasatch Fault in Utah? Using Paleoseismology and Lidar to Evaluate Earthquake Rupture Patterns

The 350-km-long Wasatch fault zone (WFZ) consists of ten west-dipping normal fault segments at the eastern boundary of the Basin and Range Province, Utah. Fresh fault scarps at the foot of the Wasatch Mountains indicate that large earthquakes have recently occurred on the WFZ, as first documented by G.K. Gilbert in the 1880s. The most recent earthquake predates written records and European settlement in the 1840s, leaving paleoseismologists to the tasks of determining the size and frequency of past earthquakes and estimating the current seismic hazard. Over three decades of paleoseismic trench research having produced abundant earthquake timing data along the central WFZ. These data have been interpreted as evidence for ruptures during large (M≥7.0) Holocene (<11 ka) earthquakes that were restricted to a single fault segment. However, uncertainties in earthquake timing permit earthquake correlations that allow for longer ruptures that spanned segment boundaries. To improve rupture length estimates and evaluate the persistence of Holocene rupture termination at central WFZ segment boundaries, a collaborative team from the USGS and the Utah Geological Survey conducted four paleoseismic trench studies near these boundaries. Data from paleoseismic trenches constrain the timing and surface displacement of Holocene earthquakes and, when integrated with results from adjacent trenches, provide new constraints on surface rupture length and earthquake magnitude. We have also analyzed new high-resolution (8 pts/m2) airborne lidar data along the central WFZ, which provide unprecedented elevation information for lake shoreline features associated with late Pleistocene Lake Bonneville. These faulted shoreline features serve as strain markers across the WFZ, permitting precise fault offset estimates near WFZ segment boundaries for the past ~10­–20 kyr. I will summarize paleoseismic and geomorphic constraints on the extent of recent surface-rupturing earthquakes and evidence for non-persistent rupture terminations at segment boundaries along the central Wasatch fault zone. These findings will permit a more accurate characterization of the earthquake hazard in the Wasatch Front region.

WebEX Info

Topic: (20) Mendenhall Seminar: Scott Bennett
Date: Wednesday, March 4, 2015
Time: 12:00 pm, Eastern Standard Time (New York, GMT-05:00)
Meeting number: 711 911 008
Meeting password: (This meeting does not require a password.)
Host Key: 819057

Click the following link to view or edit your meeting information, or to start your meeting.

https://usgs.webex.com/usgs/j.php?MTID=ma9173d91eae3b204e00fa0183c819b10

Teleconference: National Center in Reston, VA Dial In: x4848
DOI Dial In Number: 703-648-4848
Non-DOI Toll Free Dial In Number: 1-855-547-8255*
Security Code: 91930 followed by the # sign

Karst Waters Institute Award Dinner

Karst Waters Institute Award Dinner Announcement

The 2015 Karst Award honoree is Dr. David C. Culver.  Dr. Culver will speak on the topic of “Why Study Cave Life?”

Saturday, March 14, 2015, 6‐9 PM

Dos Tequilas Grill, 525 East Market Street, Leesburg, VA

In addition to Dr. Culver’s presentation, other awards will be given, including the William Wilson Scholarship.

Dinner will cost $60 per person and includes hors d’oeuvres, dinner with choice of entree, & basic beverages. A cash bar option for other drinks will be available.

Reserve your seat(s) by EITHER

(1) sending a check for $60 per person to Karst Waters Institute, PO Box 4142, Leesburg, VA 20177 or

(2) using the link at http://karstwaters.org/dinner-announcements.php  to make a payment of $62.10.

Reservations must be received by March 6.

OSB Revelle lecture: “Overturning assumptions”

Roger Revelle Commemorative Lecture

Save the Date: March 4, 2015, 5:30 PM

Reception to Follow

Overturning Assumptions:

Past, present, and future concerns about the ocean’s circulation

You are cordially invited to join the National Research Council’s Ocean Studies Board for the Sixteenth Annual Roger Revelle Commemorative Lecture.  The Revelle Lecture was created by the Ocean Studies Board in honor of Dr. Revelle’s contributions to the ocean sciences and his dedication to making scientific knowledge available to policymakers.  The 2015 speaker is Dr. Susan Lozier, Ronie-Richelle Garcia-Johnson Professor of Earth and Ocean Sciences at Duke University.

This year the lecture, Overturning Assumptions: Past, present, and future concerns about the ocean’s circulation, will examine the crucial role that ocean circulation plays in the Earth’s climate system by sequestering anthropogenic carbon dioxide and heat in the deep ocean. New research is uncovering the mechanisms that control the overturning strength and how it may change in the decades ahead. As the pieces are coming together, some long-held assumptions have been overturned and some new paradigms are surfacing.

The lecture is free and open to the public

Wednesday, March 4, 2015 at 5:30 pm

Reception to follow

Baird Auditorium in the Smithsonian’s National Museum of Natural History

Enter at 10th Street and Constitution Avenue

PGS: Geology and Public Policy – Recent Issues in Virginia

The February 19, 2015 meeting of the Potomac Geophysical Society will be held at the Fort Myer Officers’ Club in Arlington, VA (http://www.jbmhhmwr.com/index/Maps_and_Directions.html) in the Glassed-in room in the Fife and Drum (main dining room).

Geology and Public Policy – Recent Issues in Virginia

David B. Spears, State Geologist

Virginia Department of Mines, Minerals and Energy

Government decision makers are faced with difficult choices when it comes to public policy regarding energy and mineral resources. Our nation is heavily dependent on fossil fuels, radioactive isotopes, and rare earth elements that often must be imported from foreign countries to meet U.S. demand. Even though developing our own domestic supplies has obvious strategic advantages, such development often conflicts with other societal priorities such as environmental protection and social justice. To further complicate matters, conflicting pressure is brought to bear on policy makers by an uninformed or misinformed populace that is generally anti-development, and by pro-development businesses who have a financial interest in resource development. In this presentation, Virginia’s State Geologist will use recent, Virginia-specific examples such as uranium mining, offshore drilling, and shale gas to highlight the ways in which government-based geoscientists play a unique role in providing scientific guidance in public debates about how to best manage our nation’s energy and mineral resources.

David Spears is the State Geologist of Virginia, a position residing in the Department of Mines, Minerals, and Energy. He is responsible for coordinating the work of the Division of Geology and Mineral Resources, a small group of geoscientists focused on mapping Virginia’s geology, mineral resources, energy resources, and geologic hazards such as earthquakes, landslides, and sinkholes. In recent years, the State Geologist has played an increasing role in responding to public policy issues such as offshore drilling, natural hazards, and hydraulic fracturing. David received a B.S. in Geology from Lafayette College and a M.S. in Geology from Virginia Tech. He began his professional career in the petroleum industry before coming to Virginia state government in 1993. A native of New Jersey, he currently resides in Buckingham County in central Virginia. In 2012, David received the Bradley Prize from the Geological Society of Washington for his presentation about geology and public policy.

Hatfield Gate, open 24 hours a day (http://www.jbmhhmwr.com/index/Maps_and_Directions.html). Reservations are not necessary, however, we need a head count, so, if you wish to attend dinner ($25), please inform Bob Fraser at 540-888-3001 or via E-mail at fraser.robert@comcast.net. If you wish, please feel free to attend the talk without dinner. Non-members and guests are welcome. Visit the PGS web site at http://www.potomacgeophysical.com for new meeting announcements, etc. Please send changes of address or email to fraser.robert@comcast.net.

UMD Geology: “Can Flat Slabs Really Do That?” (Wagner, Carnegie)

2015 Geology Colloquium Series

Friday, January 30th 2015 at 3:00 pm
in PLS 1130, University of Maryland, College Park

Lara Wagner
CIW – Department of Terrestrial Magnetism

Can Flat Slabs Really Do That? New Constraints from New Data

PSW: The Coal Age

The Paleontological Society of Washington

Wednesday, February 18, 7:00 pm, in the Cooper room (E-207A), National Museum of Natural History, Constitutional Ave. entrance

The Coal Age — Reality, Imagination, the Search for Truth and Relevance

William DiMichele, Curator of Fossil Plants, NMNH

In this talk, we will travel back to the Carboniferous, or the “Coal Age as it is commonly called, often depicted as a vast steaming jungle of asparagus-like scale trees, giant horsetails and fern-like plants. In reality, the Carboniferous tropics were complex and dynamic, marked by broad environmental swings reflecting glacial-interglacial oscillations. Wetlands dominated the glacials transitioning to dryland forests during the interglacials, during which wetlands were reduced to refugia. Thus, the Carboniferous was both a strange and strangely familiar world with a different biota, different land masses, but climate patterns much like today. We will consider what all this means for our understanding of what this world might have looked like and what it can tell us about today.

Non-Smithsonian visitors will be escorted to the Cooper Room at 6:30 and 6:55 p.m. Society members will host the speaker for dinner at the Elephant & Castle (1201 Pennsylvania Ave.) prior to the meeting. Members may meet at the restaurant or inside the Constitutional Ave. entrance of the NMNH at 5:00 and walk to the restaurant as a group.