# depression near Greenland – logarithmic spirals in nature

$r=ae^{b\theta}$
Changing the variables $a$ and $b$ produces spirals of different qualities.  The $a$ is really an enlargement scale factor but the $b$ controls how the spiral grows per revolution.
If $b=0.2$ is more representative of an ammonite then $b=0.75$ seems to be our Greenland depression.