The Saginaw Impact Manifold
The Carolina Bays: Proximal Ejecta Surface Features
Australasian Tektites: Distal Ejecta
Geophysical Flow Analysis Confirms Relationship & Enables Triangulation To Causal Impact Site
We present a novel approach to the genesis of the Carolina bays, proposing that those enigmatic landforms are depositional features within a 1 to 10 meter-thick blanket of hydrated ejecta associated with a cosmic impact into the North American ice shield at the Mid-Pleistocene Transition, ~800,000 years ago. In the proposed scenario, a very shallow (perhaps nearly tangential) cometary impact generated the current Saginaw Bay regional depression (subsequently scoured by multiple ice sheet advances), the Carolina Bays as proximal ejecta, and the Australasian Tektites as distal ejecta. The ellipsoidal bays exhibit an "inferred orientation", facilitating the use of a triangulation network to identify the associated terrestrial impact crater. Attempts by others to triangulate bay orientations to a causal crater may have failed because the ballistic physics and fluid mechanics aspects of an ejecta distribution were not considered. An analytical model was heuristically developed to generate ejecta emplacement orientations that reflect large-scale geophysical flow effects, and its results were compared to empirically measured bay orientations at ~250 Carolina bay "fields" (representing many thousands of bays). Our model's predicted results correlate well with actual bay orientations when an oblique cosmic impact across the Saginaw area of Michigan is considered. The great-circle distances separating the proposed Saginaw impact crater and all identified Carolina bays also correlate well; the bay’s geographic distribution is along an annulus surrounding the proposed crater. These positive correlations suggest that a unique geospatial relationship exists between the proposed impact location and the Carolina bays of North America. To facilitate independent testing of the hypothesis, a web-based version of the model was made publicly available for integration with the Google Earth GIS.
InspirationThe inspiration for our conjecture was an observation in the paper The Goldsboro Ridge, an Enigma, by R. B. Daniels, E. E. Gamble and W.H. Wheeler, 1970:
The Goldsboro ridge is a unique feature on the Sunderland surface and requires special explanation whatever its origin. It must be either an erosional remnant of a once more extensive sediment or a depositional feature. ...The Goldsboro sand overlies the Sunderland Formation conformably. The contact is always abrupt but there is no evidence of deep channeling, basal coarse material, and evidence of weathering at the contact. Even the Carolina Bays do not disturb the underlying Sunderland materials.... The sand in the bay rim is not different from the Goldsboro sand. Therefore, these Carolina Bays are merely surface features associated with the formation of the ridge.
Given a confident belief that the answers are indeed out there in the sand, we come then to the true shame of the Carolina Bay story: the willingness of the current geophysical research community to tolerate and admit such a profound "mystery" in their midst. I've known respected professional earth scientists to brush off questions about Carolina Bay origin with references to "alien landings" and "giant fish." With prodding, they generally elicit a thin collage of wind and wave theory faintly recalled from their student years. One gets the distinct feeling that the study of Carolina Bay origin is the "crazy aunt in the attic" of the Coastal Plain researcher. And that visiting his dear relative is hardly worth the disturbing consequences. - George Howard
No one has yet invented an explanation which will fully account for all the facts observed - Douglas Johnson, 1942
The truth may be puzzling. It may take some work to grapple with. It may be counterintuitive. It may contradict deeply held prejudices. It may not be consonant with what we desperately want to be true. But our preferences do not determine what's true.... Cleverly designed experiments are the key. - Carl Sagan, 1995...... We present our Bearing Calculator as a very cleverly designed experiment.
Carolina bays and the AA Tektites Remain Enigmatic after a century of work
The suggestion advanced in this article may appear to many as too hypothetical to deserve the light of day. However, the tektite problem has been, and is, one of the major puzzles to men "who pick up rocks and stop to think" even before the classical paper of Suess of 1900 appeared, and conservative proposals have been found to be inadequate. - H.C. Urey, 1957
In his 1942 scholarly examination of numerous then-current hypotheses for the genesis of Carolina bays, Douglas Johnson noted:
No one has yet invented an explanation which will fully account for all the facts observed.
The Carolina bays continue to challenge geological science to this day. Their sheer numbers, distinct oval circumpheral rims, variety of sizes, and common alignments in any one area are enigmatic. Visual photography available since the bays were observed from the air in the early 1930s tells only a part of the story. Digital elevation maps (DEM) created with today’s Laser Imaging and Range Detection (LiDAR) systems accentuates their already-stunning visual presentation. While some of the bay’s characteristics are seen in sand dunes or wind-oriented paleolakes, such comparisons are unsatisfactory to us.
Researchers generally consider the bays to be formed within or excised from pre-existing strata (Prouty, 1952; Eyton & Parkhurst, 1975]. We propose that the bays are surface imperfections within a blanket of ballistically deposited shattered sedimentary strata (sand), generated at time of emplacement by the energetic deflation of steam inclusions. The authors feel this interpretation explains many of the bays’ physical characteristics, such as companion bays at different elevations, occasionally intersecting or overlaying one another. Also explained is a mechanism to create bays on ridges, the ridges themselves being composed of ejecta deposition, which is our interpretation of the Goldsboro Ridge in NC [Daniels, R.B., and E.E. Gamble, 1970].
The lack of a correlated impact structure in North America is problematic for any attempt to implicate a cosmic impact in the genesis of the Carolina bays. Our hypothesis holds that the impacting object was a massive low-density hydrated silicate object, likely a cometary body, which impacted the earth on a shallow angle, nearly tangential to the earth’s surface. Remote sensing has show that approximately 5% of all craters are created during such oblique impacts, creating a set of recognizable characteristics: oval shape, butterfly ejecta pattern, “no-fly” ejecta area up field, and “blow-out” rim down field. [Herrick, R.R, 2009; Herrick R.R. and K. Hessen, 2003]. Recent studies suggest that impacts into solid surfaces protected by a layer of low impedance materials generate structures that differ from the classic crater planforms [Schultz, P. H. and A. M. Stickle, 2009]. In our specific case, we invoke a North American continental ice shield as a low-impedance layer protecting the sedimentary strata of the Michigan basin.
An ejecta curtain wall radiating outward from a cosmic impact should follow a few simple laws of large-scale geophysical flows. We discuss our analytical model engineered to replicate those flows in the Analytical Modeling section.
This web presentation is composed of sections discussing:
- Introduction and Overview
- Unique Characteristics of Oblique Cosmic Impacts
- The Characteristics and Identification of Distal Ejecta
- Analytical Model of Carolina Bay Inferred Orientations
- Survey of Carolina Bay Landforms
- The Bearing Calculator
- The Saginaw Crater
Graphic shows the impact site and triangulation from ~200 bay "fields".
The Google Earth GIS facility has been heavily leveraged in developing the proposed solution. Images derived from Google Earth are presented under the Google Permissions Guidelines for Fair Use.
This window offers a view of our Carolina bay field index and the Saginaw Impact in Google Earth's 3-D Browser.
Our efforts in researching the Saginaw Impact Manifold and in presenting our results on the web are entirely self-funded by us. Your donation will assist us in ongoing efforts to determine the true genesis of the Carolina bay.
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