Lake Michigan
Our analysis correlates numerous proposed PZ ejecta structures structures - including the Carolina bays and the Goldsboro Ridge - to a Perigee: Zero cometary impact event that struck the Wisconson-era ice shield between 10, 000 and 17,000 years ago.
The general "rotation" of inbound ejecta trajectory represented in the Eyton & Parkhurst graphic (discussed in the Carolina bays enigma page) is the manifestation of two different factors.
Carolina bay Orientation - Eyton & Parkhurst
The first being the the Earth's rotation during the loft period applied to the main body of bays pointing NW. Ejecta droplets traveling on a more southerly bearing will land slightly further westwardly due to the faster west-to-east ground rotation vector. As a result, their azimuth will "seem" to be directed back towards a point further west than the actual ejection point. This effect will revers if the emplacement site is further towards the pole than the ejection site.
The second set of bays exhibit a trajectory more NNW. These structures are interpreted as being ejecta emplacements from an entirely different PZ impact event, occurring further to the north, and at a different time, in the Lake Huron area. A close examination of the area finds other oriented lakes with a NNE azimuth.
The following Google Earth graphic is our projected trajectory path for this set.
Carolina bay Primary Set Trajectory - linked to higher resolution image
Using a ballistic program, a set of initial conditions were developed which generates a trajectory from lake Michigan into the Goldsboro Ridge vicinity. The following graphic presents the trajectory and the settings. The initial ejection velocity used is 6.51 km/sec, which within the usual range of 5 to 8 km/sec.
The geology of lower Lake Michigan can be viewed as a shallow Perigee-Zero impact crater, formed by a shallow strike into the Wisconsin Ice sheet .
Lake Michigan as a crater structure
Note that the lake's northern structures are significantly different than those in the south of Two Rivers Ridge. Posited impact sites are:
Ludington Basin
Milwaukee Basin
Muskegon Basin
South Chippewa Basin
The graphic below presents a view of the glacial coverage of NA at the furthest advance, about 100,000 years ago. We are proposing an ice thickness of approximately 1 kilometer over the Lake Michigan impact site at the time of the event.
North American Ice Sheets
The Kankakee Torrent is commonly considered to be caused by a massive release from a dammed-up ice age lake. The trigger may well have been this impact scenario.
Perigee: Zero ejecta has created millions of freshwater bodies throughout the world. We present a sample in our Ejecta Gallery. Keep in mind when viewing these that the characteristic shape of PZ ejecta is typically found with amazing fidelity, regardless of the scale of the structure.