In the center of the clearing about 200 metrs from the parking/picnic area.

Several metal markers and an information sign

The memorial remembers the B-17 (41-24620) Snap! Crackle! Pop! of the 360th Bomber Squadron, 303rd Bomb Group, that crashed here on January 3, 1943. One of the survivors, Alan Magee planted a tree here in the 1990s to remember his crewmates KIA.

The plane was named by its original pilot, then-Lt. Jacob Wayne Fredericks, who was an engineer at the Kellogg's Cereal Co. before enlisting. As fate would have it, Lt. Fredericks and his crew took possession of the plane at Kellogg Field in Battle Creek, Michigan (the city where Kellogg's was based), and he was able to get Kellogg's in-house artist to paint the famous "Snap! Crackle! Pop!" trio from Kellogg's Rice Krispies cereal brand on the nose. Because crews had to share equipment in the early stages of the war, the crew of Lt. Arthur Adams was assigned to fly to the plane on a bombing mission over St Nazaire, France (home of a major German submarine facility) on 3-Jan-43, where it was shot down by enemy aircraft, crashing in the Escoublac Forest, West of St Nazaire, France. 7KIA 3POW MACR 15464. Navigator: Glen Herrington lost leg, was captured and later repatriated. 

In one of the most extraordinary (and well documented) stories in history of surviving a free fall, the ball turret gunner, S/SGT Alan E. Magee, was blown from the plane without a parachute, fell 22,000 ft onto the roof of the St-Nazaire train -- and SURVIVED (with the help of a German military doctor). Magee survived the war as a POW, and lived long enough to attend the dedication of a memorial to the crew of the plane at St. Nazaire in the 1990s. 

The crew included:

Lt Arthur I. Adams, Pilot, KIA
Lt Gene A. Witterstetter, Co-Pilot, KIA

LT, Glen M. Herrington, Navigator, POW

Lt Michael L. Libonati, Bombardier, KIA
Sgt Dennis C. Hart, Engineer/Top Turret, KIA
Sgt Alfred M. Union, Radio Operator, KIA
Sgt Marvin L. Milam, Waist Gunner, KIA
Sgt Edward W. Durant, Tail Gunner, KIA

S/SGT James I. Gordon, Waist Gunner, POW

S'SGT Alan. E. Magee, Bottom Turret Gunner, POW

See the nearby site La Baule-Escoublac, B-17 (41-24620) Snap! Crackle! Pop! Memorial for more on this crash and the incredible survival story of Alan Magee.

Source: https://americanarchive.iwm.org.uk/archive/aircraft/41-24620

Metal Map Marker is inscribed in French and English.  The English reads:

ON SUNDAY THE 3RD OF JANUARY 1943, AT NOON, THE US BOMBER B 17 F - 41 - 24620
<< SNAP ! CRACKLE! POP! >>
303rd GROUP (360th SQUADRON) WAS HIT OVER SAINT- NAZAIRE BY ACK-ACK. THEN ATTACKED BY TWO FIGHTERS OVER LA BAULE, IT CRASHED HERE IN ESCOUBLAC FOREST.
ABOVE SAINT-NAZAIRE, LT. LIBONATI WAS KILLED AND SGT. MAGEE WAS EJECTED. HE FELT 6000 M. WITHOUT PARACHUTE ON THE GLASS ROOF OF THE RAILWAY STATION. HE WAS OPERATED ON AND. SAVED BY A GERMAN DOCTOR.
FLYING OVER LE POULIGUEN BAY, MOST OF THE CREW BAILED-OUT WITH PARACHUTES. SGT. GORDON AND LT. HERRINGTON, HAVING LOST A LEG, WERE CAUGHT ON THE BEACH.
PUSHED BY STRONG WINDS, THREE OF FOUR SERGEANTS - DURAN, MILAM, UNION & HART DROWNED AT SEA AND THE FOURTH WAS CRASHED ON SAND.
COURAGEOUSLY THE PILOT ADAMS AND CO-PILOT WITTERSTETTER, AT THE BOMBER'S CONTROLS LAID DOWN THEIR LIVES ENSURING THAT IT WOULD NOT CRASH ON PEOPLE OF LA BAULE.
WITH ALAN E. MAGEE, ON THE 23RD OF SEPTEMBER 1995, THE AMERICAN MEMORIAL ASSOCIATION OF SAINT-NAZAIRE, THE TOWN
OF LA BAULE AND THE SOUVENIR FRANÇAIS ERECTED A GRANIT STELE IN THE MEMORY OF THESE YOUNG PILOTS WHO GAVE THEIR LIVE FOR OUR FREEDOM.

Tree Sign Marker:

Ici, le sergent Alan E. Magee a planté l'arbre de la liberté
en mèmoire et en l'honneur de ses camarades tués le 3 janvier 1943 lors du crash de leur bombardier

B-17F n°41-24620:
« SNAP ! CRACKLE! POP! »

In this place, sergeant Alan E. Magee has planted the tree of liberty
in the memory and in honor of his comrades killed on 3rd of,January 1943
during crash of their bomber B-17F n°41-24620:
SNAP! CRACKLE! POP!

Information Sign in written in French: