104 Woes JENNY 
gional structural features. For those stations, which are sufficiently 
close to local structures, the magnetic information gained from the 
vector map may, however, be connected with the local structures. 
In this respect we have already mentioned the vectors at Refugio, 
Conroe, Livingston, Mineola (Texas), Bastrop, Evangeline (Louisi- 
ana), Jackson (Mississippi), Oklahoma City, Eldorado (Kansas), and 
others.’ 
Macnetic Survey or HART--F 1eLD, MICHIGAN 
gy W.RJenny 
@ OIL WELL © ORY HOLE 
x 379 MACNETOMETER STATION 379 CAMMA = I SCCAMS 

FIG. 4 
The magnetic vector at Hart, Michigan, is another example where 
there exists a direct connection with a local commercial structure. 
The positive vector suggests a magnetic “high,” southeast of Hart, 
which might correspond with an uplift with a possible northeast- 
southwesterly axis. Prompted by this suggestion, the writer has made 
a casual magnetic survey of the recently discovered Hart field in order 
to check the conclusions drawn from the vector map. Figure 4 shows 
7™W. P. Jenny, op. cit. 
626 
